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  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ptv_SubsequentEventsTable_65bf4a7b-9c7c-47d4-beab-544627fa9e3a_terseLabel_en-US" xlink:label="lab_ptv_SubsequentEventsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Events [Table]</link:label>
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    <link:label id="lab_ifrs-full_LeaseLiabilitiesMember_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease liabilities [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LeaseLiabilitiesMember"/>
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    <link:label id="lab_ptv_SubsidiaryNotesPayableMember_label_en-US" xlink:label="lab_ptv_SubsidiaryNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Notes Payable [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryNotesPayableMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryNotesPayableMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryNotesPayableMember"/>
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    <link:label id="lab_ptv_NotImpairedLineItems_8010fe82-5422-41ba-a9db-73786f9b2bdb_terseLabel_en-US" xlink:label="lab_ptv_NotImpairedLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired [Line Items]</link:label>
    <link:label id="lab_ptv_NotImpairedLineItems_label_en-US" xlink:label="lab_ptv_NotImpairedLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired [Line Items]</link:label>
    <link:label id="lab_ptv_NotImpairedLineItems_documentation_en-US" xlink:label="lab_ptv_NotImpairedLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NotImpairedLineItems" xlink:href="ptv-20211231.xsd#ptv_NotImpairedLineItems"/>
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    <link:label id="lab_ptv_PercentNumberOfSharesHeld_63fc7806-cadf-42b2-a1f3-289d00ed5a27_terseLabel_en-US" xlink:label="lab_ptv_PercentNumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent, number of shares held</link:label>
    <link:label id="lab_ptv_PercentNumberOfSharesHeld_label_en-US" xlink:label="lab_ptv_PercentNumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent, number of shares held</link:label>
    <link:label id="lab_ptv_PercentNumberOfSharesHeld_documentation_en-US" xlink:label="lab_ptv_PercentNumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent, number of shares held</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PercentNumberOfSharesHeld" xlink:href="ptv-20211231.xsd#ptv_PercentNumberOfSharesHeld"/>
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    <link:label id="lab_ptv_RestrictedShareUnitsRSUMember_f4316baa-0677-44e7-9269-5cc230adc6f6_terseLabel_en-US" xlink:label="lab_ptv_RestrictedShareUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Share Units</link:label>
    <link:label id="lab_ptv_RestrictedShareUnitsRSUMember_label_en-US" xlink:label="lab_ptv_RestrictedShareUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Share Units (RSU) [Member]</link:label>
    <link:label id="lab_ptv_RestrictedShareUnitsRSUMember_documentation_en-US" xlink:label="lab_ptv_RestrictedShareUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Share Units (RSU) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RestrictedShareUnitsRSUMember" xlink:href="ptv-20211231.xsd#ptv_RestrictedShareUnitsRSUMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RestrictedShareUnitsRSUMember" xlink:to="lab_ptv_RestrictedShareUnitsRSUMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_4da89f59-27e7-47fd-80bc-ec66f549dc07_terseLabel_en-US" xlink:label="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss with respect to associate for which no deferred tax asset is recognized</link:label>
    <link:label id="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of loss with respect to associate for which no deferred tax asset is recognized, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of loss with respect to associate for which no deferred tax asset is recognized, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_RateOfLossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesAbstract_c14ecb73-41ba-4cef-a62f-f8fe7d15e625_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary operating companies</link:label>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesAbstract_label_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary operating companies [Abstract]</link:label>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesAbstract_documentation_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary operating companies</link:label>
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    <link:label id="lab_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax_706e964c-5f41-4727-803a-016908e077a7_terseLabel_en-US" xlink:label="lab_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, net of tax</link:label>
    <link:label id="lab_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax_label_en-US" xlink:label="lab_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, net of tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="lab_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncomeTaxTypeAxis_6545125a-b307-4d7d-9abe-5e251218a401_terseLabel_en-US" xlink:label="lab_ptv_IncomeTaxTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Type [Axis]</link:label>
    <link:label id="lab_ptv_IncomeTaxTypeAxis_label_en-US" xlink:label="lab_ptv_IncomeTaxTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Type [Axis]</link:label>
    <link:label id="lab_ptv_IncomeTaxTypeAxis_documentation_en-US" xlink:label="lab_ptv_IncomeTaxTypeAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncomeTaxTypeAxis" xlink:href="ptv-20211231.xsd#ptv_IncomeTaxTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncomeTaxTypeAxis" xlink:to="lab_ptv_IncomeTaxTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CashDistribution_fc600ced-d84f-44ed-8c44-be50eca55186_terseLabel_en-US" xlink:label="lab_ptv_CashDistribution" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash Distribution</link:label>
    <link:label id="lab_ptv_CashDistribution_label_en-US" xlink:label="lab_ptv_CashDistribution" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash Distribution</link:label>
    <link:label id="lab_ptv_CashDistribution_documentation_en-US" xlink:label="lab_ptv_CashDistribution" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash Distribution</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CashDistribution" xlink:href="ptv-20211231.xsd#ptv_CashDistribution"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CashDistribution" xlink:to="lab_ptv_CashDistribution" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_05c6b616-9de2-4ec3-b049-f7c1ae7e4fd9_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ExercisePriceRangeOneMember_eaa5ad65-2c99-4837-a46d-87d17a805530_terseLabel_en-US" xlink:label="lab_ptv_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">0.01</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeOneMember_label_en-US" xlink:label="lab_ptv_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeOneMember_documentation_en-US" xlink:label="lab_ptv_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExercisePriceRangeOneMember" xlink:href="ptv-20211231.xsd#ptv_ExercisePriceRangeOneMember"/>
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    <link:label id="lab_dei_SecurityExchangeName_ae7f6cd7-2f6d-4dbb-b5ec-3362ec117db7_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Security Exchange Name</link:label>
    <link:label id="lab_dei_SecurityExchangeName_label_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Security Exchange Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityExchangeName"/>
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    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt_43b18ce9-1b80-42bf-9a8a-4c4f6ca1179b_terseLabel_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of convertible debt</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt_label_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of convertible debt</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt_documentation_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of convertible debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:href="ptv-20211231.xsd#ptv_GainLossFromChangeInFairValueOfConvertibleDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:to="lab_ptv_GainLossFromChangeInFairValueOfConvertibleDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock_3c05eda7-ddd5-4759-a4ab-a0ceedc6b45a_terseLabel_en-US" xlink:label="lab_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Subsidiary Preferred Share balances</link:label>
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    <link:label id="lab_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Subsidiary Preferred Shares Balances</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock" xlink:href="ptv-20211231.xsd#ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock" xlink:to="lab_ptv_SummaryOfSubsidiaryPreferredSharesBalancesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AmortisationExpense_d98c9b49-df9c-42db-9432-abb0078373ca_terseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization of intangible assets</link:label>
    <link:label id="lab_ifrs-full_AmortisationExpense_60c38618-085f-4010-8dd0-f3e55ffe8d05_verboseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortisation expense</link:label>
    <link:label id="lab_ifrs-full_AmortisationExpense_label_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AmortisationExpense" xlink:to="lab_ifrs-full_AmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate_50e77836-b00c-4f63-81cd-732df221394a_terseLabel_en-US" xlink:label="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Executive Compensation</link:label>
    <link:label id="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Executive compensation, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Executive compensation, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_ExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Goodwill_dd01802a-255d-4a47-83dd-a968295984cb_terseLabel_en-US" xlink:label="lab_ifrs-full_Goodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_Goodwill_label_en-US" xlink:label="lab_ifrs-full_Goodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_Goodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Goodwill" xlink:to="lab_ifrs-full_Goodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_f8cb780f-c575-4121-8cad-7781af7f9b50_terseLabel_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for rent - interest</link:label>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_label_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash outflow for leases</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashOutflowForLeases" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashOutflowForLeases"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashOutflowForLeases" xlink:to="lab_ifrs-full_CashOutflowForLeases" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCountry_cd3cfbeb-0f54-4a25-b430-0a3a7e858a81_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCountry" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Country</link:label>
    <link:label id="lab_dei_EntityAddressCountry_label_en-US" xlink:label="lab_dei_EntityAddressCountry" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Country</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCountry"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCountry" xlink:to="lab_dei_EntityAddressCountry" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MaturityAxis_2cc06d9c-a561-4dde-9687-4f5f96b7ffb8_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturity [axis]</link:label>
    <link:label id="lab_ifrs-full_MaturityAxis_label_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MaturityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaturityAxis" xlink:to="lab_ifrs-full_MaturityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_a731e8be-00d3-4b26-a332-0f1ac40ee6d9_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for leases [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c666424f-c134-4fca-8215-0cbd3d3e74ed_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Name [Axis]</link:label>
    <link:label id="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_label_en-US" xlink:label="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Name [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TaxEffectedMember_4199bf33-0417-4a03-9ad7-4041584baf2f_terseLabel_en-US" xlink:label="lab_ptv_TaxEffectedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Effected</link:label>
    <link:label id="lab_ptv_TaxEffectedMember_label_en-US" xlink:label="lab_ptv_TaxEffectedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Effected [Member]</link:label>
    <link:label id="lab_ptv_TaxEffectedMember_documentation_en-US" xlink:label="lab_ptv_TaxEffectedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Effected</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TaxEffectedMember" xlink:href="ptv-20211231.xsd#ptv_TaxEffectedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TaxEffectedMember" xlink:to="lab_ptv_TaxEffectedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember_cd3164af-ae5a-4786-8111-871f3592485c_terseLabel_en-US" xlink:label="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Shares, value realised assigned to PureTech Health, LLC [Member]</link:label>
    <link:label id="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember_label_en-US" xlink:label="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary Shares, value realised assigned to PureTech Health, LLC [Member]</link:label>
    <link:label id="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember_documentation_en-US" xlink:label="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary Shares, value realised assigned to PureTech Health, LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:href="ptv-20211231.xsd#ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:to="lab_ptv_OrdinarySharesValueRealisedAssignedToPureTechHealthLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WithinThreeMonthsMember_fb6cc5c1-ae09-4738-bc27-a83751adcf02_terseLabel_en-US" xlink:label="lab_ptv_WithinThreeMonthsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Within Three Months</link:label>
    <link:label id="lab_ptv_WithinThreeMonthsMember_label_en-US" xlink:label="lab_ptv_WithinThreeMonthsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Within Three Months [Member]</link:label>
    <link:label id="lab_ptv_WithinThreeMonthsMember_documentation_en-US" xlink:label="lab_ptv_WithinThreeMonthsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Within Three Months</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WithinThreeMonthsMember" xlink:href="ptv-20211231.xsd#ptv_WithinThreeMonthsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WithinThreeMonthsMember" xlink:to="lab_ptv_WithinThreeMonthsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonControlledFoundedEntitiesMember_58d281b1-2866-4fd0-b7b6-282eabd7cfbb_terseLabel_en-US" xlink:label="lab_ptv_NonControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlled Founded Entities</link:label>
    <link:label id="lab_ptv_NonControlledFoundedEntitiesMember_label_en-US" xlink:label="lab_ptv_NonControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlled Founded Entities [Member]</link:label>
    <link:label id="lab_ptv_NonControlledFoundedEntitiesMember_documentation_en-US" xlink:label="lab_ptv_NonControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlled Founded Entities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonControlledFoundedEntitiesMember" xlink:href="ptv-20211231.xsd#ptv_NonControlledFoundedEntitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonControlledFoundedEntitiesMember" xlink:to="lab_ptv_NonControlledFoundedEntitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AverageNumberOfEmployees_5117715f-9142-480c-bf6e-6fa02b57745c_terseLabel_en-US" xlink:label="lab_ifrs-full_AverageNumberOfEmployees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average number of employees</link:label>
    <link:label id="lab_ifrs-full_AverageNumberOfEmployees_label_en-US" xlink:label="lab_ifrs-full_AverageNumberOfEmployees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average number of employees</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AverageNumberOfEmployees" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AverageNumberOfEmployees"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AverageNumberOfEmployees" xlink:to="lab_ifrs-full_AverageNumberOfEmployees" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets_7ad62549-153b-4dd6-9563-ebb9ab3009e2_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(loss) on disposal of assets</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) on disposals of non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets" xlink:to="lab_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToAbstract_5ccf227d-466e-4d8f-81b8-c25c44af32f7_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income/(loss) attributable to:</link:label>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToAbstract_label_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss), attributable to [abstract]</link:label>
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    <link:label id="lab_ptv_EntregaAndVedantaMember_a1f0dfaf-0233-4dc8-8204-cb814ca99681_terseLabel_en-US" xlink:label="lab_ptv_EntregaAndVedantaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega and Vedanta</link:label>
    <link:label id="lab_ptv_EntregaAndVedantaMember_label_en-US" xlink:label="lab_ptv_EntregaAndVedantaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega and Vedanta [Member]</link:label>
    <link:label id="lab_ptv_EntregaAndVedantaMember_documentation_en-US" xlink:label="lab_ptv_EntregaAndVedantaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega and Vedanta</link:label>
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    <link:label id="lab_ptv_MinimumLiquidationPreference_999f1e98-241d-4819-ab65-6a6e4e1b8c0a_terseLabel_en-US" xlink:label="lab_ptv_MinimumLiquidationPreference" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreference_label_en-US" xlink:label="lab_ptv_MinimumLiquidationPreference" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreference_documentation_en-US" xlink:label="lab_ptv_MinimumLiquidationPreference" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MinimumLiquidationPreference" xlink:href="ptv-20211231.xsd#ptv_MinimumLiquidationPreference"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_MinimumLiquidationPreference" xlink:to="lab_ptv_MinimumLiquidationPreference" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AccumulatedDepreciationAndAmortisationMember_f3642544-491a-40b4-8328-b77940a5009d_terseLabel_en-US" xlink:label="lab_ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accumulated amortization</link:label>
    <link:label id="lab_ifrs-full_AccumulatedDepreciationAndAmortisationMember_label_en-US" xlink:label="lab_ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accumulated depreciation and amortisation [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:to="lab_ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding_4d976d81-031f-4a94-8f4b-ca28c0346a46_terseLabel_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Final fee, percentage of original principal amount outstanding</link:label>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding_label_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, final fee, percentage of original principal amount outstanding</link:label>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding_documentation_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, final fee, percentage of original principal amount outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:href="ptv-20211231.xsd#ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:to="lab_ptv_DebtInstrumentPaymentTermsFinalFeePercentageOfOriginalPrincipalAmountOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement_ff49f4a6-0c88-487f-822e-9dadaba11a30_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value, RSU vested (in GBP per share)</link:label>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement_label_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value of other equity instruments Vested in share-based payment arrangement</link:label>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement_documentation_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value of other equity instruments Vested in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:to="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock_6203becf-16f3-4ad1-9ce2-28473254e260_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Total Operating Expense</link:label>
    <link:label id="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Total Operating Expense Explanatory [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Total Operating Expense Explanatory</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:to="lab_ptv_DisclosureOfTotalOperatingExpenseExplanatoryTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsequentEventsLineItems_ebc96848-9d61-460a-adaa-b6eceadc345b_terseLabel_en-US" xlink:label="lab_ptv_SubsequentEventsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Events [Line Items]</link:label>
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    <link:label id="lab_ptv_SubsequentEventsLineItems_documentation_en-US" xlink:label="lab_ptv_SubsequentEventsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Events</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsequentEventsLineItems" xlink:href="ptv-20211231.xsd#ptv_SubsequentEventsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsequentEventsLineItems" xlink:to="lab_ptv_SubsequentEventsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract_label_en-US" xlink:label="lab_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [Abstract]</link:label>
    <link:label id="lab_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract_documentation_en-US" xlink:label="lab_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:href="ptv-20211231.xsd#ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:to="lab_ptv_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OperatingExpenseMember_bf7aa5cb-3bcc-45f0-bb0f-86b5f7d04a1c_terseLabel_en-US" xlink:label="lab_ptv_OperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense [Member]</link:label>
    <link:label id="lab_ptv_OperatingExpenseMember_label_en-US" xlink:label="lab_ptv_OperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense [Member]</link:label>
    <link:label id="lab_ptv_OperatingExpenseMember_documentation_en-US" xlink:label="lab_ptv_OperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OperatingExpenseMember" xlink:href="ptv-20211231.xsd#ptv_OperatingExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OperatingExpenseMember" xlink:to="lab_ptv_OperatingExpenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember_b134281f-d1ea-4ca6-8e4f-e45135b15c97_terseLabel_en-US" xlink:label="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated fair value of the preferred share</link:label>
    <link:label id="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember_label_en-US" xlink:label="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated fair value of the convertible preferred shares, measurement input [Member]</link:label>
    <link:label id="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated fair value of the convertible preferred shares, measurement input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:href="ptv-20211231.xsd#ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:to="lab_ptv_EstimatedFairValueOfTheConvertiblePreferredSharesMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities_b3b408d1-40f4-456e-86dc-affa7e2ae3b8_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from maturity of short-term investments</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from sales or maturity of financial instruments, classified as investing activities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsMember_eb53400a-171b-4906-91b8-4f7cabd85da9_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial instruments, class [member]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsMember_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial instruments, class [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:to="lab_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OtherNotIncludingVedantaMember_fcfec101-4bc6-4924-9c9f-7d2c4fccfb59_terseLabel_en-US" xlink:label="lab_ptv_OtherNotIncludingVedantaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other not including Vedanta [Member]</link:label>
    <link:label id="lab_ptv_OtherNotIncludingVedantaMember_label_en-US" xlink:label="lab_ptv_OtherNotIncludingVedantaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other not including Vedanta [Member]</link:label>
    <link:label id="lab_ptv_OtherNotIncludingVedantaMember_documentation_en-US" xlink:label="lab_ptv_OtherNotIncludingVedantaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other not including Vedanta</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OtherNotIncludingVedantaMember" xlink:href="ptv-20211231.xsd#ptv_OtherNotIncludingVedantaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OtherNotIncludingVedantaMember" xlink:to="lab_ptv_OtherNotIncludingVedantaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_a96254bf-7703-445e-b18e-6fc0466daea8_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements</link:label>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_label_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseholdImprovementsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LeaseholdImprovementsMember"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_d6b6274a-7f47-49e3-8b83-a5cb721aa256_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property and Equipment</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_12855749-0761-4743-a6a1-42578b6e1576_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies</link:label>
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    <link:label id="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_f877d8c5-9e79-4608-a42f-c70ab7039572_terseLabel_en-US" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payment of lease liability</link:label>
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    <link:label id="lab_ptv_DisclosureOfGainOnDeconsolidationTextBlock_26c55909-2c3b-4a8e-bc8f-cb2ed09e3417_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfGainOnDeconsolidationTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of gain on deconsolidation</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputAssets_29bbcff6-568e-4f6b-87f4-7d338cdc4a17_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Asset Increase/ (Decrease)</link:label>
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    <link:label id="lab_ptv_GeneralAndAdministrativeMember_4e228072-1737-4f6e-9629-69b4988daada_terseLabel_en-US" xlink:label="lab_ptv_GeneralAndAdministrativeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General And Administrative [Member]</link:label>
    <link:label id="lab_ptv_GeneralAndAdministrativeMember_label_en-US" xlink:label="lab_ptv_GeneralAndAdministrativeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General And Administrative [Member]</link:label>
    <link:label id="lab_ptv_GeneralAndAdministrativeMember_documentation_en-US" xlink:label="lab_ptv_GeneralAndAdministrativeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General And Administrative</link:label>
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    <link:label id="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_d1c6e710-234e-4a9e-a9e3-11976fef6d51_terseLabel_en-US" xlink:label="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Useful life measured as period of time, property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Useful life measured as period of time, property, plant and equipment</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfShareCapitalMember_85930119-a5cc-4f31-8102-c7e755ab955a_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital [member]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfShareCapitalMember_label_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ClassesOfShareCapitalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfShareCapitalMember" xlink:to="lab_ifrs-full_ClassesOfShareCapitalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ConstructionInProgressMember_a26aa658-2748-47e9-a8bc-42a36c42b8a9_terseLabel_en-US" xlink:label="lab_ifrs-full_ConstructionInProgressMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Construction in progress [member]</link:label>
    <link:label id="lab_ifrs-full_ConstructionInProgressMember_label_en-US" xlink:label="lab_ifrs-full_ConstructionInProgressMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Construction in progress [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConstructionInProgressMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ConstructionInProgressMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ConstructionInProgressMember" xlink:to="lab_ifrs-full_ConstructionInProgressMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapital_9fe07005-57dc-4982-a57f-51b57333e333_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_label_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapital" xlink:to="lab_ifrs-full_IssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_dfa74747-98d3-45e4-9961-3c1389d5ce0f_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, adjustment to interest rate basis</link:label>
    <link:label id="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_label_en-US" xlink:label="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, adjustment to interest rate basis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:to="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_0bf3bb43-f14c-449d-9ed7-b91c0572e7e1_terseLabel_en-US" xlink:label="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of exchange rates on cash and cash equivalents</link:label>
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    <link:label id="lab_ifrs-full_CurrentLiabilities_d839f947-3922-4197-a017-c553aa6acdbd_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total current liabilities</link:label>
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    <link:label id="lab_ifrs-full_CurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EquityAcquiredShareCapitalPureTechLLCLineItems_2004a0c3-0477-49c4-9207-718aec0182ab_terseLabel_en-US" xlink:label="lab_ptv_EquityAcquiredShareCapitalPureTechLLCLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity - Acquired Share capital PureTech LLC [Line Items]</link:label>
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    <link:label id="lab_ptv_EnsofHoldingsLLCMember_2191ab3f-2f32-4df5-846b-11ebd8a771c1_verboseLabel_en-US" xlink:label="lab_ptv_EnsofHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ensof Holdings, LLC (held indirectly through Enlight)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DirectorsAndSeniorManagersMember_2c96e19d-867b-4a5f-8213-ec3171461a45_terseLabel_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers</link:label>
    <link:label id="lab_ptv_DirectorsAndSeniorManagersMember_label_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers [Member]</link:label>
    <link:label id="lab_ptv_DirectorsAndSeniorManagersMember_documentation_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DirectorsAndSeniorManagersMember" xlink:href="ptv-20211231.xsd#ptv_DirectorsAndSeniorManagersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DirectorsAndSeniorManagersMember" xlink:to="lab_ptv_DirectorsAndSeniorManagersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl_56ee033e-f2a6-46c9-ab19-bf5ae3fde226_terseLabel_en-US" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease In Number Of Shares Outstanding, Changes In Ownership Interest In Subsidiaries That Do Not Result In Loss Of Control</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl_label_en-US" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease In Number Of Shares Outstanding, Changes In Ownership Interest In Subsidiaries That Do Not Result In Loss Of Control</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl_documentation_en-US" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease In Number Of Shares Outstanding, Changes In Ownership Interest In Subsidiaries That Do Not Result In Loss Of Control</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl" xlink:href="ptv-20211231.xsd#ptv_IncreaseDecreaseInNumberOfSharesOutstandingChangesInOwnershipInterestInSubsidiariesThatDoNotResultInLossOfControl"/>
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    <link:label id="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_b34b805a-3085-4a08-9234-e5fe809e3322_terseLabel_en-US" xlink:label="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss with respect to associate for which no deferred tax asset is recognized</link:label>
    <link:label id="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss with respect to associate for which no deferred tax asset is recognized , reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss with respect to associate for which no deferred tax asset is recognized, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_LossWithRespectToAssociateForWhichNoDeferredTaxAssetIsRecognizedReconciliationOfEffectiveTaxRate"/>
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    <link:label id="lab_ifrs-full_DisclosureOfGoingConcernExplanatory_e9192daf-4b5f-4c24-ad75-7837c2e0ca18_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfGoingConcernExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Going Concern</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfGoingConcernExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfGoingConcernExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of going concern [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGoingConcernExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfGoingConcernExplanatory"/>
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    <link:label id="lab_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember_c6404417-ecc5-4b3d-b662-cc530d5c1f1a_terseLabel_en-US" xlink:label="lab_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transferred at a point in time &#8211; Licensing Income</link:label>
    <link:label id="lab_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember_label_en-US" xlink:label="lab_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goods or services transferred at point in time [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember" xlink:to="lab_ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OtherNonControllingInterestEquity_34efbda3-0310-4b98-b04e-4f3ee37f78b4_terseLabel_en-US" xlink:label="lab_ptv_OtherNonControllingInterestEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ptv_OtherNonControllingInterestEquity_label_en-US" xlink:label="lab_ptv_OtherNonControllingInterestEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other, non-controlling interest, equity</link:label>
    <link:label id="lab_ptv_OtherNonControllingInterestEquity_documentation_en-US" xlink:label="lab_ptv_OtherNonControllingInterestEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other, non-controlling interest, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OtherNonControllingInterestEquity" xlink:href="ptv-20211231.xsd#ptv_OtherNonControllingInterestEquity"/>
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    <link:label id="lab_ptv_GelesisMember_dbd00de8-b4ae-44dc-9e37-3db60397d3a3_verboseLabel_en-US" xlink:label="lab_ptv_GelesisMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gelesis, Inc.</link:label>
    <link:label id="lab_ptv_GelesisMember_a4621d73-2e7f-4118-9ec4-30e1a990287a_terseLabel_en-US" xlink:label="lab_ptv_GelesisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gelesis [Member]</link:label>
    <link:label id="lab_ptv_GelesisMember_label_en-US" xlink:label="lab_ptv_GelesisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gelesis [Member]</link:label>
    <link:label id="lab_ptv_GelesisMember_documentation_en-US" xlink:label="lab_ptv_GelesisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gelesis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GelesisMember" xlink:href="ptv-20211231.xsd#ptv_GelesisMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GelesisMember" xlink:to="lab_ptv_GelesisMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate_df6fbe37-cc90-4dce-9717-dadb907bd694_terseLabel_en-US" xlink:label="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deconsolidation adjustments</link:label>
    <link:label id="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of deconsolidation adjustments, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of deconsolidation adjustments, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_RateOfDeconsolidationAdjustmentsReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShortTermNoteLineItems_a4197fd2-712e-43fb-9f0a-9042154ca987_terseLabel_en-US" xlink:label="lab_ptv_ShortTermNoteLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Line Items]</link:label>
    <link:label id="lab_ptv_ShortTermNoteLineItems_label_en-US" xlink:label="lab_ptv_ShortTermNoteLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Line Items]</link:label>
    <link:label id="lab_ptv_ShortTermNoteLineItems_documentation_en-US" xlink:label="lab_ptv_ShortTermNoteLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShortTermNoteLineItems" xlink:href="ptv-20211231.xsd#ptv_ShortTermNoteLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShortTermNoteLineItems" xlink:to="lab_ptv_ShortTermNoteLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_MergedEntityGelesisAndCapstarMember_3cc160fc-52f3-4b8e-be86-d5db30e1c5da_terseLabel_en-US" xlink:label="lab_ptv_MergedEntityGelesisAndCapstarMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Merged entity Gelesis and Capstar</link:label>
    <link:label id="lab_ptv_MergedEntityGelesisAndCapstarMember_label_en-US" xlink:label="lab_ptv_MergedEntityGelesisAndCapstarMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Merged entity Gelesis and Capstar [Member]</link:label>
    <link:label id="lab_ptv_MergedEntityGelesisAndCapstarMember_documentation_en-US" xlink:label="lab_ptv_MergedEntityGelesisAndCapstarMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Merged entity Gelesis and Capstar</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MergedEntityGelesisAndCapstarMember" xlink:href="ptv-20211231.xsd#ptv_MergedEntityGelesisAndCapstarMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_MergedEntityGelesisAndCapstarMember" xlink:to="lab_ptv_MergedEntityGelesisAndCapstarMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems_faadce81-0cb6-465b-8f0d-f881141ed008_terseLabel_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Line Items]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems_label_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Line Items]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems_documentation_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:href="ptv-20211231.xsd#ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:to="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_80dc3723-17e7-4e64-a9d8-da3273cc64ef_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) on financial assets at fair value through profit or loss, designated upon initial recognition or subsequently</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) on financial assets at fair value through profit or loss, designated upon initial recognition or subsequently</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition"/>
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    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_405ba854-fa24-44ea-a8a8-d1af2cd4ca22_verboseLabel_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Range of Exercise Prices (GBP)</link:label>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_67e399e3-9583-4b1c-84a5-ba260cc42c02_terseLabel_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range $</link:label>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_label_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price of outstanding share options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:to="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_cd88c5e5-f98e-435e-90d5-d913c85d6f97_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_label_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityWellKnownSeasonedIssuer" xlink:to="lab_dei_EntityWellKnownSeasonedIssuer" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate_e2aacd77-1c34-4b98-81b0-9546cc4925c0_terseLabel_en-US" xlink:label="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Expense</link:label>
    <link:label id="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of interest expense, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of interest expense, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_RateOfInterestExpenseReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock_318cb4d8-a793-43ef-aa79-c001346f2317_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of changes in financial liabilities - Warrants</link:label>
    <link:label id="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial liabilities - Warrants [Table Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial liabilities - Warrants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:to="lab_ptv_DisclosureOfFinancialLiabilitiesWarrantsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TenantImprovementsRightOfUseAssets_321c3407-51a9-4f14-a66d-35608b48ff7c_terseLabel_en-US" xlink:label="lab_ptv_TenantImprovementsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tenant improvement - lease incentive</link:label>
    <link:label id="lab_ptv_TenantImprovementsRightOfUseAssets_label_en-US" xlink:label="lab_ptv_TenantImprovementsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tenant improvements, Right of use Assets</link:label>
    <link:label id="lab_ptv_TenantImprovementsRightOfUseAssets_documentation_en-US" xlink:label="lab_ptv_TenantImprovementsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tenant improvements, Right of use Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TenantImprovementsRightOfUseAssets" xlink:href="ptv-20211231.xsd#ptv_TenantImprovementsRightOfUseAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TenantImprovementsRightOfUseAssets" xlink:to="lab_ptv_TenantImprovementsRightOfUseAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceLineItems_86e08568-b97c-471a-a7c8-555987faad87_terseLabel_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Line Items]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceLineItems_label_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Line Items]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceLineItems_documentation_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MinimumLiquidationPreferenceLineItems" xlink:href="ptv-20211231.xsd#ptv_MinimumLiquidationPreferenceLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_MinimumLiquidationPreferenceLineItems" xlink:to="lab_ptv_MinimumLiquidationPreferenceLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_e99d170c-9c76-4b4c-bab5-fc9e4c64df4c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:to="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock_f807312a-c82d-4c4d-b518-a09b4d7003ee_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease receivable</link:label>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease receivable [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:to="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseReceivableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonCashItemsAbstract_8336ae1e-8733-4848-9a70-525d00b2fa3a_terseLabel_en-US" xlink:label="lab_ptv_NonCashItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-cash items:</link:label>
    <link:label id="lab_ptv_NonCashItemsAbstract_label_en-US" xlink:label="lab_ptv_NonCashItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-cash items [Abstract]</link:label>
    <link:label id="lab_ptv_NonCashItemsAbstract_documentation_en-US" xlink:label="lab_ptv_NonCashItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-cash items</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonCashItemsAbstract" xlink:href="ptv-20211231.xsd#ptv_NonCashItemsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonCashItemsAbstract" xlink:to="lab_ptv_NonCashItemsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock_d3928804-8020-4c47-8a03-3c213b7627d6_terseLabel_en-US" xlink:label="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Instruments Issued by the Group</link:label>
    <link:label id="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock_label_en-US" xlink:label="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for equity instruments issued by the group [Policy Text Block]</link:label>
    <link:label id="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock_documentation_en-US" xlink:label="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for equity instruments issued by the group</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:href="ptv-20211231.xsd#ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:to="lab_ptv_DescriptionOfAccountingPolicyForEquityInstrumentsIssuedByTheGroupPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PurchasesOfConvertibleNote_c5717aef-790e-451a-9ed8-f375b83e9b3e_terseLabel_en-US" xlink:label="lab_ptv_PurchasesOfConvertibleNote" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of convertible note</link:label>
    <link:label id="lab_ptv_PurchasesOfConvertibleNote_label_en-US" xlink:label="lab_ptv_PurchasesOfConvertibleNote" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases of Convertible Note</link:label>
    <link:label id="lab_ptv_PurchasesOfConvertibleNote_documentation_en-US" xlink:label="lab_ptv_PurchasesOfConvertibleNote" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases of Convertible Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchasesOfConvertibleNote" xlink:href="ptv-20211231.xsd#ptv_PurchasesOfConvertibleNote"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchasesOfConvertibleNote" xlink:to="lab_ptv_PurchasesOfConvertibleNote" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SeriesA2PreferredMember_0f7d9649-6021-4ac9-9a17-5dd5920af700_terseLabel_en-US" xlink:label="lab_ptv_SeriesA2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-2 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA2PreferredMember_label_en-US" xlink:label="lab_ptv_SeriesA2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-2 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA2PreferredMember_documentation_en-US" xlink:label="lab_ptv_SeriesA2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-2 Preferred [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SeriesA2PreferredMember" xlink:href="ptv-20211231.xsd#ptv_SeriesA2PreferredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SeriesA2PreferredMember" xlink:to="lab_ptv_SeriesA2PreferredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract_label_en-US" xlink:label="lab_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital And Financial Risk Management Credit Risk [Abstract]</link:label>
    <link:label id="lab_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract_documentation_en-US" xlink:label="lab_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital And Financial Risk Management [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract" xlink:href="ptv-20211231.xsd#ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract" xlink:to="lab_ptv_CapitalAndFinancialRiskManagementCreditRiskAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationLineItems_7638852c-0d34-453a-87fd-52c7bd74896d_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document and Entity Information [Line Items]</link:label>
    <link:label id="lab_dei_DocumentInformationLineItems_label_en-US" xlink:label="lab_dei_DocumentInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentInformationLineItems" xlink:to="lab_dei_DocumentInformationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_NoTradingSymbolFlag_e63bece7-3001-42ac-a14a-075707892576_terseLabel_en-US" xlink:label="lab_dei_NoTradingSymbolFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">No Trading Symbol Flag</link:label>
    <link:label id="lab_dei_NoTradingSymbolFlag_label_en-US" xlink:label="lab_dei_NoTradingSymbolFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">No Trading Symbol Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_NoTradingSymbolFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_NoTradingSymbolFlag" xlink:to="lab_dei_NoTradingSymbolFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment_81b1a710-d65c-4b76-8741-2552ba4d9d80_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Initial Investment</link:label>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment_label_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Initial Investment</link:label>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment_documentation_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Initial Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:href="ptv-20211231.xsd#ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:to="lab_ptv_BusinessCombinationInvestmentInCommonShareInitialInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GeographicalAreasAxis_4d92cfcd-817e-4299-81e4-6b17759cff4b_terseLabel_en-US" xlink:label="lab_ifrs-full_GeographicalAreasAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Geographical areas [axis]</link:label>
    <link:label id="lab_ifrs-full_GeographicalAreasAxis_label_en-US" xlink:label="lab_ifrs-full_GeographicalAreasAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Geographical areas [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeographicalAreasAxis" xlink:to="lab_ifrs-full_GeographicalAreasAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestExpenseOnLeaseLiabilities_266d97a4-ea4e-4949-ac0e-d5b1e9a37981_verboseLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense on lease liability</link:label>
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    <link:label id="lab_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_e2ac03cc-8b2e-4e59-bce5-ecaa424688e0_terseLabel_en-US" xlink:label="lab_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impairment of investment</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfLiabilitiesAxis_6d4652b3-7e64-45ee-aecf-38ba4063eef4_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of liabilities [axis]</link:label>
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    <link:label id="lab_ptv_CustomerBMember_7b8236b3-29a0-4b33-b302-c26dbe223f28_terseLabel_en-US" xlink:label="lab_ptv_CustomerBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer B</link:label>
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    <link:label id="lab_ifrs-full_GoodsOrServicesTransferredOverTimeMember_35513919-7810-470a-8d4f-e8b91aed13c9_terseLabel_en-US" xlink:label="lab_ifrs-full_GoodsOrServicesTransferredOverTimeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transferred over time</link:label>
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    <link:label id="lab_ptv_PayrollCosts_87cf6f96-7c08-4fc0-826a-ba26f8574039_terseLabel_en-US" xlink:label="lab_ptv_PayrollCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregate payroll costs</link:label>
    <link:label id="lab_ptv_PayrollCosts_f6821542-b20d-49ac-a7e2-9127b9e19e2a_totalLabel_en-US" xlink:label="lab_ptv_PayrollCosts" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Payroll Costs</link:label>
    <link:label id="lab_ptv_PayrollCosts_label_en-US" xlink:label="lab_ptv_PayrollCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payroll Costs</link:label>
    <link:label id="lab_ptv_PayrollCosts_documentation_en-US" xlink:label="lab_ptv_PayrollCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payroll Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PayrollCosts" xlink:href="ptv-20211231.xsd#ptv_PayrollCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PayrollCosts" xlink:to="lab_ptv_PayrollCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetDeferredTaxLiabilities_cc2bb963-24ee-4812-a182-3abbd83ac556_terseLabel_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liabilities, net, recognized</link:label>
    <link:label id="lab_ifrs-full_NetDeferredTaxLiabilities_label_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net deferred tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NetDeferredTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetDeferredTaxLiabilities" xlink:to="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsByNameMember_6efc1525-2559-423a-ae67-695daf967103_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings by name [member]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameMember_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings by name [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_BorrowingsByNameMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsByNameMember" xlink:to="lab_ifrs-full_BorrowingsByNameMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock_18db5e3d-65bc-4885-8eec-d8396f33c2c9_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of accumulated depreciation and impairment loss</link:label>
    <link:label id="lab_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of accumulated depreciation and impairment loss [Text Block]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock" xlink:to="lab_ptv_DisclosureOfAccumulatedDepreciationAndImpairmentLossTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_feccf157-855c-44b6-b6f6-ccb9b536bb9a_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from sale of property and equipment</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from sales of property, plant and equipment, classified as investing activities</link:label>
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    <link:label id="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_4ab9d767-a7e6-4d07-98d7-cc013988a7ac_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of investments held at fair value</link:label>
    <link:label id="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities</link:label>
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    <link:label id="lab_ptv_BusinessCombinationNumberOfAdditionalSharesToBeReceivedAtNoAdditionalCost_1c15b165-ba1b-439c-98fa-0123648f06c2_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfAdditionalSharesToBeReceivedAtNoAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, number of additional shares to be received at no additional cost</link:label>
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    <link:label id="lab_ptv_DisclosureOfTaxBalancesAsPresentedInStatementOfFinancialPositionTextBlock_7dc38b4a-f01d-4568-82d1-c35755116886_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfTaxBalancesAsPresentedInStatementOfFinancialPositionTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of tax balances as presented in Statement of Financial Position</link:label>
    <link:label id="lab_ptv_DisclosureOfTaxBalancesAsPresentedInStatementOfFinancialPositionTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfTaxBalancesAsPresentedInStatementOfFinancialPositionTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of tax balances as presented in Statement of Financial Position [Text Block]</link:label>
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    <link:label id="lab_ifrs-full_ProceedsFromNoncurrentBorrowings_4d520947-ee87-4306-b4bc-429635752bcd_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of long term loan</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from non-current borrowings</link:label>
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    <link:label id="lab_ptv_SegmentInformationAbstract_label_en-US" xlink:label="lab_ptv_SegmentInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment Information [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_SegmentInformationAbstract" xlink:href="ptv-20211231.xsd#ptv_SegmentInformationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SegmentInformationAbstract" xlink:to="lab_ptv_SegmentInformationAbstract" xlink:type="arc" order="1"/>
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    <link:label id="lab_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_16e02a21-bd7e-4ddd-8c3b-ffc282726fde_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average remaining contractual life of outstanding share options (in years)</link:label>
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    <link:label id="lab_ifrs-full_WagesAndSalaries_c41b1e2d-22bd-4bd4-9ec4-fcf458dc9461_terseLabel_en-US" xlink:label="lab_ifrs-full_WagesAndSalaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Salaries and wages</link:label>
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    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_30d86470-9122-4d6c-9d32-1b2be0704190_terseLabel_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Healthcare benefits</link:label>
    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_label_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee benefits expense</link:label>
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    <link:label id="lab_ptv_DisclosureOfReconciliationOfEffectiveTaxRateTextBlock_1afc3348-1ded-4870-af63-e34cde6642fd_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfReconciliationOfEffectiveTaxRateTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Reconciliation of Effective Tax Rate</link:label>
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    <link:label id="lab_ptv_FinancialInstrumentsWarrantsAbstract_documentation_en-US" xlink:label="lab_ptv_FinancialInstrumentsWarrantsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments - Warrants</link:label>
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    <link:label id="lab_ptv_BorrowingsInterestPaid_136ebe7c-8f1c-4cb1-a378-db9016dc6495_terseLabel_en-US" xlink:label="lab_ptv_BorrowingsInterestPaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest paid</link:label>
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    <link:label id="lab_ptv_CommenseMember_label_en-US" xlink:label="lab_ptv_CommenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commense [Member]</link:label>
    <link:label id="lab_ptv_CommenseMember_documentation_en-US" xlink:label="lab_ptv_CommenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CommenseMember" xlink:href="ptv-20211231.xsd#ptv_CommenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CommenseMember" xlink:to="lab_ptv_CommenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RecognisedIncomeTaxExpenseLineItems_b3ab2251-891a-4cd9-b6a8-3ae8c5e8789e_terseLabel_en-US" xlink:label="lab_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recognised Income Tax Expense [Line Items]</link:label>
    <link:label id="lab_ptv_RecognisedIncomeTaxExpenseLineItems_label_en-US" xlink:label="lab_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recognised Income Tax Expense [Line Items]</link:label>
    <link:label id="lab_ptv_RecognisedIncomeTaxExpenseLineItems_documentation_en-US" xlink:label="lab_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recognised Income Tax Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:href="ptv-20211231.xsd#ptv_RecognisedIncomeTaxExpenseLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:to="lab_ptv_RecognisedIncomeTaxExpenseLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParentMember_d275656c-435b-462e-8a69-8e896edf0304_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total parent equity [member]</link:label>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParentMember_label_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity attributable to owners of parent [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesMember_e8ebe4d4-eb8c-4665-8fb6-fb98e0e798eb_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Operating Companies [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesMember_label_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Operating Companies [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryOperatingCompaniesMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryOperatingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Operating Companies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryOperatingCompaniesMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryOperatingCompaniesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryOperatingCompaniesMember" xlink:to="lab_ptv_SubsidiaryOperatingCompaniesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_d3c3589a-44d6-4145-8979-2213e5a1fff2_terseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Owners of the Company</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_label_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Comprehensive income, attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CustomerAMember_c70b1866-a9e5-4d8d-8eaf-3b6a03f329d1_terseLabel_en-US" xlink:label="lab_ptv_CustomerAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer A</link:label>
    <link:label id="lab_ptv_CustomerAMember_label_en-US" xlink:label="lab_ptv_CustomerAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer A [Member]</link:label>
    <link:label id="lab_ptv_CustomerAMember_documentation_en-US" xlink:label="lab_ptv_CustomerAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CustomerAMember" xlink:href="ptv-20211231.xsd#ptv_CustomerAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CustomerAMember" xlink:to="lab_ptv_CustomerAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryConvertibleNotesMember_5d22c987-1dcb-40fd-b08b-ca6242058515_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Convertible Notes</link:label>
    <link:label id="lab_ptv_SubsidiaryConvertibleNotesMember_label_en-US" xlink:label="lab_ptv_SubsidiaryConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Convertible Notes [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryConvertibleNotesMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Convertible Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryConvertibleNotesMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryConvertibleNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryConvertibleNotesMember" xlink:to="lab_ptv_SubsidiaryConvertibleNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RSULineItems_583b8257-8e0f-45e9-81f6-356907972b72_terseLabel_en-US" xlink:label="lab_ptv_RSULineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU [Line Items]</link:label>
    <link:label id="lab_ptv_RSULineItems_label_en-US" xlink:label="lab_ptv_RSULineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU [Line Items]</link:label>
    <link:label id="lab_ptv_RSULineItems_documentation_en-US" xlink:label="lab_ptv_RSULineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RSULineItems" xlink:href="ptv-20211231.xsd#ptv_RSULineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RSULineItems" xlink:to="lab_ptv_RSULineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_e66aaaad-26c2-4f02-8d89-aa356195c770_terseLabel_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_label_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent" xlink:to="lab_dei_EntityInteractiveDataCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetInvestmentInFinanceLease_a00b3a18-e7da-48a0-9e48-484e8700fdf2_terseLabel_en-US" xlink:label="lab_ifrs-full_NetInvestmentInFinanceLease" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net investment in the lease</link:label>
    <link:label id="lab_ifrs-full_NetInvestmentInFinanceLease_label_en-US" xlink:label="lab_ifrs-full_NetInvestmentInFinanceLease" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net investment in finance lease</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetInvestmentInFinanceLease" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NetInvestmentInFinanceLease"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetInvestmentInFinanceLease" xlink:to="lab_ifrs-full_NetInvestmentInFinanceLease" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EarningsCategoryDomain_568c2ea7-a527-4e47-a07f-992c475a202f_terseLabel_en-US" xlink:label="lab_ptv_EarningsCategoryDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Category [Domain]</link:label>
    <link:label id="lab_ptv_EarningsCategoryDomain_label_en-US" xlink:label="lab_ptv_EarningsCategoryDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Category [Domain]</link:label>
    <link:label id="lab_ptv_EarningsCategoryDomain_documentation_en-US" xlink:label="lab_ptv_EarningsCategoryDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Category [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EarningsCategoryDomain" xlink:href="ptv-20211231.xsd#ptv_EarningsCategoryDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EarningsCategoryDomain" xlink:to="lab_ptv_EarningsCategoryDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_73b8faa1-200b-41e4-b405-307b94a35d8b_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in subsidiary</link:label>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_label_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:to="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssueOfEquity_2ef9bd36-9c72-42af-b0de-bf4c0fe7207b_terseLabel_en-US" xlink:label="lab_ifrs-full_IssueOfEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of new preferred shares</link:label>
    <link:label id="lab_ifrs-full_IssueOfEquity_label_en-US" xlink:label="lab_ifrs-full_IssueOfEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issue of equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IssueOfEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssueOfEquity" xlink:to="lab_ifrs-full_IssueOfEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_4dccaa5e-5c49-4898-82d1-69bd1f0af20c_terseLabel_en-US" xlink:label="lab_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contingent consideration recognised as of acquisition date</link:label>
    <link:label id="lab_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contingent consideration recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_81baab94-6a6c-4658-9118-b563ab005a47_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fixed assets</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PropertyPlantAndEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:to="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DrRajuKucherlapatiMember_021c8bfd-5328-4f78-adb4-6bfdfccc3441_terseLabel_en-US" xlink:label="lab_ptv_DrRajuKucherlapatiMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Raju Kucherlapati</link:label>
    <link:label id="lab_ptv_DrRajuKucherlapatiMember_label_en-US" xlink:label="lab_ptv_DrRajuKucherlapatiMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Raju Kucherlapati [Member]</link:label>
    <link:label id="lab_ptv_DrRajuKucherlapatiMember_documentation_en-US" xlink:label="lab_ptv_DrRajuKucherlapatiMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Raju Kucherlapati</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DrRajuKucherlapatiMember" xlink:href="ptv-20211231.xsd#ptv_DrRajuKucherlapatiMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DrRajuKucherlapatiMember" xlink:to="lab_ptv_DrRajuKucherlapatiMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables_0d957af7-f4a2-474c-99e3-406204c4cf15_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for increase (decrease) in other operating payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_Deconsolidation_29fee09c-9113-4e62-991c-7f8220237091_terseLabel_en-US" xlink:label="lab_ptv_Deconsolidation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deconsolidation</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets_ad9b01d3-2775-455b-9fc5-5ab1fcea7478_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(loss) on investments held at fair value</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_f4f463f4-4bb4-4302-b61d-d27c5e0ef5ce_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments</link:label>
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    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfCompanyTextBlock_f24e6c7a-9893-47b1-8a68-77c7789a5ad1_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfCompanyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Earnings/(Loss) attributable to owners of company</link:label>
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    <link:label id="lab_ifrs-full_CurrentPortionOfLongtermBorrowings_441be711-a690-446d-8b09-82c79dece5f0_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current portion of long-term loan</link:label>
    <link:label id="lab_ifrs-full_CurrentPortionOfLongtermBorrowings_label_en-US" xlink:label="lab_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current portion of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentPortionOfLongtermBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:to="lab_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromContinuingOperations_4596e1c2-5ee8-4c0b-ae18-7a09a68af407_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossFromContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income/(loss) from continuing operations (100%)</link:label>
    <link:label id="lab_ifrs-full_ProfitLossFromContinuingOperations_label_en-US" xlink:label="lab_ifrs-full_ProfitLossFromContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss) from continuing operations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromContinuingOperations" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProfitLossFromContinuingOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromContinuingOperations" xlink:to="lab_ifrs-full_ProfitLossFromContinuingOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareOfNetAssets_1bf46b29-cacd-4090-b59f-09355a88a8ef_terseLabel_en-US" xlink:label="lab_ptv_ShareOfNetAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Group's share of net assets</link:label>
    <link:label id="lab_ptv_ShareOfNetAssets_label_en-US" xlink:label="lab_ptv_ShareOfNetAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of net assets</link:label>
    <link:label id="lab_ptv_ShareOfNetAssets_documentation_en-US" xlink:label="lab_ptv_ShareOfNetAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of net assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareOfNetAssets" xlink:href="ptv-20211231.xsd#ptv_ShareOfNetAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareOfNetAssets" xlink:to="lab_ptv_ShareOfNetAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock_bdc631c0-4ed8-41be-b17f-e1c14d4b09bf_terseLabel_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plan -Vedanta 2010 Plan - Range of assumptions of Fair Value of stock option grants</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock_label_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plan -Vedanta 2010 Plan - Range of assumptions of Fair Value of stock option grants [Text Block]</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock_documentation_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plan - Vedanta - Range of assumptions of Fair Value of stock option grants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:href="ptv-20211231.xsd#ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:to="lab_ptv_SignificantSubsidiaryPlanVedanta2010PlanRangeOfAssumptionsOfFairValueOfStockOptionGrantsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PureTechHealthCompanyMember_0ece1822-9845-4b8c-96e1-27968c1e1bce_terseLabel_en-US" xlink:label="lab_ptv_PureTechHealthCompanyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Health (Company)</link:label>
    <link:label id="lab_ptv_PureTechHealthCompanyMember_label_en-US" xlink:label="lab_ptv_PureTechHealthCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Health (Company) [Member]</link:label>
    <link:label id="lab_ptv_PureTechHealthCompanyMember_documentation_en-US" xlink:label="lab_ptv_PureTechHealthCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Health (Company)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PureTechHealthCompanyMember" xlink:href="ptv-20211231.xsd#ptv_PureTechHealthCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PureTechHealthCompanyMember" xlink:to="lab_ptv_PureTechHealthCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_fbf12c53-f1d3-4145-89d3-fcd2b4638b73_netLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible assets, net</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_eb0e6009-f005-4bfc-80f1-86c9a5f6ad6a_periodStartLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at beginning of period</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_a2cefcaf-a818-4ad9-a460-f664f4fa35a5_periodEndLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at end of period</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible assets other than goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:to="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_726637b4-93d9-410e-8d25-c128cfe18c62_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through other changes, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceCosts_c6ae8fb8-97f5-4c0c-ac43-8c6006a549be_negatedLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance costs &#8211; contractual</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_3fc9269b-5f62-4ac5-8778-edf7a8289b02_negatedTotalLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total finance cost &#8211; contractual</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_label_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_FinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceCosts" xlink:to="lab_ifrs-full_FinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_InactiveSubsidiariesAbstract_717ab74a-c9c4-4fa1-9308-ee3fc615888d_terseLabel_en-US" xlink:label="lab_ptv_InactiveSubsidiariesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inactive subsidiaries</link:label>
    <link:label id="lab_ptv_InactiveSubsidiariesAbstract_label_en-US" xlink:label="lab_ptv_InactiveSubsidiariesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inactive subsidiaries [Abstract]</link:label>
    <link:label id="lab_ptv_InactiveSubsidiariesAbstract_documentation_en-US" xlink:label="lab_ptv_InactiveSubsidiariesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inactive subsidiaries</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_InactiveSubsidiariesAbstract" xlink:href="ptv-20211231.xsd#ptv_InactiveSubsidiariesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_InactiveSubsidiariesAbstract" xlink:to="lab_ptv_InactiveSubsidiariesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_e8d064e1-bcd1-4f28-9c74-36aa5ab083bc_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other receivables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AcquiredMinorityNonControllingInterest_cd1afe3a-86de-473d-94ec-1b5e6e3c1184_terseLabel_en-US" xlink:label="lab_ptv_AcquiredMinorityNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquired minority non-controlling interest</link:label>
    <link:label id="lab_ptv_AcquiredMinorityNonControllingInterest_label_en-US" xlink:label="lab_ptv_AcquiredMinorityNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquired minority non-controlling interest</link:label>
    <link:label id="lab_ptv_AcquiredMinorityNonControllingInterest_documentation_en-US" xlink:label="lab_ptv_AcquiredMinorityNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquired minority non-controlling interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AcquiredMinorityNonControllingInterest" xlink:href="ptv-20211231.xsd#ptv_AcquiredMinorityNonControllingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AcquiredMinorityNonControllingInterest" xlink:to="lab_ptv_AcquiredMinorityNonControllingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromCurrentBorrowings_33dc5fec-3b7f-4107-985a-60b7eb4e73c4_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromCurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receipt of PPP loan</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromCurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromCurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromCurrentBorrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProceedsFromCurrentBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromCurrentBorrowings" xlink:to="lab_ifrs-full_ProceedsFromCurrentBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_628fc49d-834b-495e-82c0-711f8b6af279_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Four to five years</link:label>
    <link:label id="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than four years and not later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ImbriumTherapeuticsLPMember_5ea2b5db-1286-4956-85a2-04763945d263_terseLabel_en-US" xlink:label="lab_ptv_ImbriumTherapeuticsLPMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Imbrium Therapeutics L.P. [Member]</link:label>
    <link:label id="lab_ptv_ImbriumTherapeuticsLPMember_label_en-US" xlink:label="lab_ptv_ImbriumTherapeuticsLPMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Imbrium Therapeutics L.P. [Member]</link:label>
    <link:label id="lab_ptv_ImbriumTherapeuticsLPMember_documentation_en-US" xlink:label="lab_ptv_ImbriumTherapeuticsLPMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Imbrium Therapeutics L.P.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ImbriumTherapeuticsLPMember" xlink:href="ptv-20211231.xsd#ptv_ImbriumTherapeuticsLPMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ImbriumTherapeuticsLPMember" xlink:to="lab_ptv_ImbriumTherapeuticsLPMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialLiabilitiesTable_ca15bd80-56ea-4bb6-aba9-55405608377e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial liabilities [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialLiabilitiesTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial liabilities [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfFinancialLiabilitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:to="lab_ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock_94e0500a-467e-4f83-bc92-10dd26fe7e57_terseLabel_en-US" xlink:label="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Investments in Associates</link:label>
    <link:label id="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock_label_en-US" xlink:label="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Investments in Associates [Text Block]</link:label>
    <link:label id="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Investments in Associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:href="ptv-20211231.xsd#ptv_SummaryOfInvestmentsInAssociatesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:to="lab_ptv_SummaryOfInvestmentsInAssociatesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentTransitionReport_a1f2b2c0-0cdf-4838-9203-32314abea4b0_terseLabel_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Transition Report</link:label>
    <link:label id="lab_dei_DocumentTransitionReport_label_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Transition Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentTransitionReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentTransitionReport" xlink:to="lab_dei_DocumentTransitionReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember_9d5a2e19-0bad-42e8-a538-626a61020312_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for impairment of financial assets [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for impairment of financial assets [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember" xlink:to="lab_ifrs-full_EntitysTotalForImpairmentOfFinancialAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NumberOfOptionsHeld_6f3aa17c-bdab-4fd4-88d6-72edb0acc4d5_terseLabel_en-US" xlink:label="lab_ptv_NumberOfOptionsHeld" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Options held</link:label>
    <link:label id="lab_ptv_NumberOfOptionsHeld_label_en-US" xlink:label="lab_ptv_NumberOfOptionsHeld" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Options held</link:label>
    <link:label id="lab_ptv_NumberOfOptionsHeld_documentation_en-US" xlink:label="lab_ptv_NumberOfOptionsHeld" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Options held</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfOptionsHeld" xlink:href="ptv-20211231.xsd#ptv_NumberOfOptionsHeld"/>
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    <link:label id="lab_ptv_SubsidiaryPreferredSharesAbstract_d1404b40-8177-470d-86d4-4c9d1ac57d23_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Abstract]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesAbstract_label_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Abstract]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesAbstract_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryPreferredSharesAbstract" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryPreferredSharesAbstract"/>
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    <link:label id="lab_ptv_ShareBasedPaymentsTableLineItems_be8d6a34-1d0c-44e2-835b-6fd154e94251_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table [Line Items]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsTableLineItems_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table [Line Items]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsTableLineItems_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentsTableLineItems" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentsTableLineItems"/>
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    <link:label id="lab_ptv_RiskFreeInterestRateMeasurementInputMember_7734bfb0-041c-4fd7-b2f2-3fa78297a003_terseLabel_en-US" xlink:label="lab_ptv_RiskFreeInterestRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk free interest rate</link:label>
    <link:label id="lab_ptv_RiskFreeInterestRateMeasurementInputMember_label_en-US" xlink:label="lab_ptv_RiskFreeInterestRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk Free Interest Rate, measurement input [Member]</link:label>
    <link:label id="lab_ptv_RiskFreeInterestRateMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_RiskFreeInterestRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk Free Interest Rate, measurement input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RiskFreeInterestRateMeasurementInputMember" xlink:href="ptv-20211231.xsd#ptv_RiskFreeInterestRateMeasurementInputMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory_9841007d-85dd-4d58-8a3f-c08265afc303_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) per Share</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of earnings per share [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfEarningsPerShareExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:to="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesMember_a807dfe0-9dde-4b18-bc23-236f1cb8d846_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesMember_label_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryPreferredSharesMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryPreferredSharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryPreferredSharesMember" xlink:to="lab_ptv_SubsidiaryPreferredSharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ScheduleOfConvertibleNotesTextBlock_ab6b619b-41ff-446d-954b-7783db52e4a5_terseLabel_en-US" xlink:label="lab_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Convertible Notes</link:label>
    <link:label id="lab_ptv_ScheduleOfConvertibleNotesTextBlock_label_en-US" xlink:label="lab_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Convertible Notes [Text Block]</link:label>
    <link:label id="lab_ptv_ScheduleOfConvertibleNotesTextBlock_documentation_en-US" xlink:label="lab_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Convertible Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:href="ptv-20211231.xsd#ptv_ScheduleOfConvertibleNotesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:to="lab_ptv_ScheduleOfConvertibleNotesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock_d6c81bb4-1a86-4a91-b754-eb1dfeb081cd_terseLabel_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary convertible note into subsidiary common stock (NCI)</link:label>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock_label_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary Convertible note into subsidiary common stock</link:label>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock_documentation_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary Convertible note into subsidiary common stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:href="ptv-20211231.xsd#ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:to="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoSubsidiaryCommonStock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities_92f64599-ddfc-442a-a2de-13127f638d34_terseLabel_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary convertible note into preferred share liabilities</link:label>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities_label_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary Convertible note into preferred share liabilities</link:label>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities_documentation_en-US" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of subsidiary Convertible note into preferred share liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:href="ptv-20211231.xsd#ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:to="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForAssociatesMember_b9e003e4-8abe-4cbf-af41-ffd562fc420d_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForAssociatesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for associates [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForAssociatesMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForAssociatesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for associates [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForAssociatesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EntitysTotalForAssociatesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForAssociatesMember" xlink:to="lab_ifrs-full_EntitysTotalForAssociatesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_54ab13d8-092c-4e66-b40b-b165a743f113_terseLabel_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_label_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_IcfrAuditorAttestationFlag" xlink:to="lab_dei_IcfrAuditorAttestationFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement_3a8bfc24-391f-4b9a-a65d-235f26d2226f_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average stock price of share options exercised in share-based payment arrangement (GBP)</link:label>
    <link:label id="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement_label_en-US" xlink:label="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average stock price of share options exercised in share-based payment arrangement</link:label>
    <link:label id="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement_documentation_en-US" xlink:label="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average stock price of share options exercised in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:to="lab_ptv_WeightedAverageStockPriceOfShareOptionsExercisedInShareBasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities_e4f4c04d-b02b-4e66-b403-e687eff487fe_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest paid, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:to="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MergerReserveMember_fb580eee-465b-463e-9bec-b25189d5c817_terseLabel_en-US" xlink:label="lab_ifrs-full_MergerReserveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Merger reserve [member]</link:label>
    <link:label id="lab_ifrs-full_MergerReserveMember_label_en-US" xlink:label="lab_ifrs-full_MergerReserveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Merger reserve [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MergerReserveMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MergerReserveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MergerReserveMember" xlink:to="lab_ifrs-full_MergerReserveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ControlledFoundedEntitiesMember_c2b6c82b-7fdb-4aec-82d5-04ee2f9b5456_terseLabel_en-US" xlink:label="lab_ptv_ControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Controlled Founded Entities</link:label>
    <link:label id="lab_ptv_ControlledFoundedEntitiesMember_label_en-US" xlink:label="lab_ptv_ControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Controlled Founded Entities [Member]</link:label>
    <link:label id="lab_ptv_ControlledFoundedEntitiesMember_documentation_en-US" xlink:label="lab_ptv_ControlledFoundedEntitiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Controlled Founded Entities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ControlledFoundedEntitiesMember" xlink:href="ptv-20211231.xsd#ptv_ControlledFoundedEntitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ControlledFoundedEntitiesMember" xlink:to="lab_ptv_ControlledFoundedEntitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SignificantUnobservableInputAssets_d7d85e89-8c0d-4e9c-a396-f7ea7a606983_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average</link:label>
    <link:label id="lab_ifrs-full_SignificantUnobservableInputAssets_label_en-US" xlink:label="lab_ifrs-full_SignificantUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant unobservable input, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantUnobservableInputAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_SignificantUnobservableInputAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantUnobservableInputAssets" xlink:to="lab_ifrs-full_SignificantUnobservableInputAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationExpense_8dfa7477-be6b-433b-9ab7-6a14f7a824ed_terseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation of tangible assets</link:label>
    <link:label id="lab_ifrs-full_DepreciationExpense_530a14b0-8de9-4e34-8b87-bc2321efe362_verboseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation expense</link:label>
    <link:label id="lab_ifrs-full_DepreciationExpense_label_en-US" xlink:label="lab_ifrs-full_DepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DepreciationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationExpense" xlink:to="lab_ifrs-full_DepreciationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MajorCustomersAxis_84d4f7df-d342-491f-8b5c-627adefa7ec5_terseLabel_en-US" xlink:label="lab_ifrs-full_MajorCustomersAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customers over 10% of revenue</link:label>
    <link:label id="lab_ifrs-full_MajorCustomersAxis_e4d81bd4-c8ab-458b-a967-e619a13470f7_verboseLabel_en-US" xlink:label="lab_ifrs-full_MajorCustomersAxis" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major customers [axis]</link:label>
    <link:label id="lab_ifrs-full_MajorCustomersAxis_label_en-US" xlink:label="lab_ifrs-full_MajorCustomersAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major customers [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorCustomersAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MajorCustomersAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MajorCustomersAxis" xlink:to="lab_ifrs-full_MajorCustomersAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable_874e2f73-1026-4244-be43-fedd363b99e4_terseLabel_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Table]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable_label_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Table]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable_documentation_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:href="ptv-20211231.xsd#ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:to="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestExpenseOnBorrowings_bc7f93f9-3a30-434c-99a5-62736ac987ed_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense on other borrowings</link:label>
    <link:label id="lab_ifrs-full_InterestExpenseOnBorrowings_label_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense on borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestExpenseOnBorrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_InterestExpenseOnBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestExpenseOnBorrowings" xlink:to="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentShellCompanyReport_74a0495d-fb8a-43c4-a1d8-76e7f2f21638_terseLabel_en-US" xlink:label="lab_dei_DocumentShellCompanyReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Shell Company Report</link:label>
    <link:label id="lab_dei_DocumentShellCompanyReport_label_en-US" xlink:label="lab_dei_DocumentShellCompanyReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Shell Company Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentShellCompanyReport" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentShellCompanyReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentShellCompanyReport" xlink:to="lab_dei_DocumentShellCompanyReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DiscountRateMeasurementInputMember_6cb283ad-175b-425f-8655-a20456c5f284_terseLabel_en-US" xlink:label="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount Rate</link:label>
    <link:label id="lab_ifrs-full_DiscountRateMeasurementInputMember_label_en-US" xlink:label="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount rate, measurement input [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscountRateMeasurementInputMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DiscountRateMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DiscountRateMeasurementInputMember" xlink:to="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of changes in equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_StatementOfChangesInEquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfChangesInEquityAbstract" xlink:to="lab_ifrs-full_StatementOfChangesInEquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_2d5be921-e726-4267-87e0-eeb4a7f11bfa_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other financial assets</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for decrease (increase) in other assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedLineItems_425f5e72-2861-4f16-95f7-57f2c510eabb_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited [Line Items]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedLineItems_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited [Line Items]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedLineItems_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsForfeitedLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:to="lab_ptv_WeightedAverageOptionsForfeitedLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_91c9692a-41d2-4362-ac6b-1de16e11db4f_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssets_de5a1999-4a30-4ade-864d-94775c04d933_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssets_label_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LighthouseCapitalPartnersVILPMember_295b6ff7-84a8-4e7d-a551-3db6239220d4_terseLabel_en-US" xlink:label="lab_ptv_LighthouseCapitalPartnersVILPMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lighthouse Capital Partners VI, L.P</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_LighthouseCapitalPartnersVILPMember" xlink:href="ptv-20211231.xsd#ptv_LighthouseCapitalPartnersVILPMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LighthouseCapitalPartnersVILPMember" xlink:to="lab_ptv_LighthouseCapitalPartnersVILPMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionOfConvertibleNotes_0029394c-891f-4bf4-9f21-78ae33e15062_terseLabel_en-US" xlink:label="lab_ptv_ConversionOfConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of convertible notes into preferred shares - non cash financing activity</link:label>
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    <link:label id="lab_ptv_ConversionOfConvertibleNotes_documentation_en-US" xlink:label="lab_ptv_ConversionOfConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of convertible notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionOfConvertibleNotes" xlink:href="ptv-20211231.xsd#ptv_ConversionOfConvertibleNotes"/>
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    <link:label id="lab_ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock_c19be1c3-056d-4d14-9476-e70b35364be0_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock" xlink:to="lab_ptv_DisclosureOfSubsidiaryPreferredSharesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRevenueExplanatory_73b57499-2562-41a2-9ce8-04ffaf1ef872_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRevenueExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of revenue [text block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRevenueExplanatory" xlink:to="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonControllingInterestsAbstract_2e44a6eb-a407-4347-b0a2-3c4d47f2c719_terseLabel_en-US" xlink:label="lab_ptv_NonControllingInterestsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Abstract]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsAbstract_label_en-US" xlink:label="lab_ptv_NonControllingInterestsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Abstract]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsAbstract_documentation_en-US" xlink:label="lab_ptv_NonControllingInterestsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems_b14fd1c5-3cc9-4eb2-a0b3-6b95f2a838f0_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about intangible assets [line items]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfOperatingSegmentsExplanatory_93187556-458b-481c-9dd4-00ba23900dcb_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of operating segments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOperatingSegmentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of operating segments [text block]</link:label>
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    <link:label id="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf_16b19608-ce09-4e21-b6a8-ed5e18789169_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Arrangement after tax deduction, Cash Used to Settle Award</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Settlement, cash received by employee after tax withheld on employee's behalf</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentSettlementCashReceivedByEmployeeAfterTaxWithheldOnEmployeesBehalf" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Settlement, cash received by employee after tax withheld on employee's behalf</link:label>
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    <link:label id="lab_ifrs-full_AdditionsToRightofuseAssets_805fecfb-20c5-4c18-8e67-03aff5090d51_terseLabel_en-US" xlink:label="lab_ifrs-full_AdditionsToRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions</link:label>
    <link:label id="lab_ifrs-full_AdditionsToRightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_AdditionsToRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions to right-of-use assets</link:label>
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    <link:label id="lab_ptv_DrRobertLangerMember_955ab650-3716-465e-a65c-e562958d5278_terseLabel_en-US" xlink:label="lab_ptv_DrRobertLangerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Robert Langer [Member]</link:label>
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    <link:label id="lab_ptv_DrRobertLangerMember_documentation_en-US" xlink:label="lab_ptv_DrRobertLangerMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Robert Langer</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_bd2790aa-f8a2-4f34-a561-1f1b9e8748f8_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other operating expense</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other operating expense [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:to="lab_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesTable_23159bd5-223b-4f29-9e0e-566eea4ffbd2_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesTable_label_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesTable_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryPreferredSharesTable" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryPreferredSharesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryPreferredSharesTable" xlink:to="lab_ptv_SubsidiaryPreferredSharesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory_2998a187-7193-4ecc-85db-8a686ca7e3c9_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities [text block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable_9785cea8-0357-4969-889f-0ede23c20978_terseLabel_en-US" xlink:label="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity - Acquired Share capital PureTech LLC [Table]</link:label>
    <link:label id="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable_label_en-US" xlink:label="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity - Acquired Share capital PureTech LLC [Table]</link:label>
    <link:label id="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable_documentation_en-US" xlink:label="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity - Acquired Share capital PureTech LLC [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:href="ptv-20211231.xsd#ptv_EquityAcquiredShareCapitalPureTechLLCTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:to="lab_ptv_EquityAcquiredShareCapitalPureTechLLCTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures_de658c6b-f37e-4cd7-98e5-89a56d36c13b_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issuance of convertible notes in subsidiary</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issue of bonds, notes and debentures</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:to="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011_dc93c594-4746-47b0-b2b1-98eb1c2e4be7_terseLabel_en-US" xlink:label="lab_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liability for share based awards</link:label>
    <link:label id="lab_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011_label_en-US" xlink:label="lab_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liabilities from share-based payment transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:to="lab_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingAbstract_4f64cabf-3c96-4474-ae75-45a833010602_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingAbstract_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingAbstract_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsOutstandingAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:to="lab_ptv_WeightedAverageOptionsOutstandingAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_647a96d6-9585-4aa9-bf3d-109084fdc871_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Grant date fair value</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average fair value at measurement date, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:to="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OtherSellingGeneralAndAdministrativeExpense_64f6c3df-be74-4952-8a8b-1bc6ab1fafe5_terseLabel_en-US" xlink:label="lab_ptv_OtherSellingGeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other selling, general and administrative expenses</link:label>
    <link:label id="lab_ptv_OtherSellingGeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_ptv_OtherSellingGeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Selling General and Administrative Expense</link:label>
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    <link:label id="lab_ptv_InvestorMember_documentation_en-US" xlink:label="lab_ptv_InvestorMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investor</link:label>
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    <link:label id="lab_ifrs-full_OtherTemporaryDifferencesMember_65f6bb52-5065-4a30-9a98-38967350a2a8_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other temporary differences</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_06625850-51df-4627-bc38-391724829734_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [line items]</link:label>
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    <link:label id="lab_ifrs-full_UnearnedFinanceIncomeRelatingToFinanceLeasePaymentsReceivable_afc1bf00-e8e1-4477-97e1-048d8b16f030_terseLabel_en-US" xlink:label="lab_ifrs-full_UnearnedFinanceIncomeRelatingToFinanceLeasePaymentsReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unearned Finance income</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems_169fa6b3-f25a-4516-bacf-5f8d8ccd876b_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities [line items]</link:label>
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    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncome_71c37839-d8dc-472d-be03-37cf57580feb_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total deferred income tax expense/(benefit)</link:label>
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    <link:label id="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_dae68b47-297d-4bcf-941a-c89192787351_verboseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Granted (in shares)</link:label>
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    <link:label id="lab_dei_DocumentFiscalYearFocus_e62d653b-d3e4-44f0-a1f7-411251e85e0a_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Year Focus</link:label>
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    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_ef61f812-dbb0-484d-b6b3-d2b267d30f19_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payment expense</link:label>
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    <link:label id="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_ae4705c9-34c8-4b95-acfd-60006b5eef75_terseLabel_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Losses</link:label>
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    <link:label id="lab_ptv_FinancialInstrumentsAbstract_documentation_en-US" xlink:label="lab_ptv_FinancialInstrumentsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments [Abstract]</link:label>
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    <link:label id="lab_ptv_OperatingLossCarryforwardsNotSubjectToExpirationMember_5e2066f8-0c6d-4613-990f-1669f3a75f13_terseLabel_en-US" xlink:label="lab_ptv_OperatingLossCarryforwardsNotSubjectToExpirationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Loss Carryforwards Not Subject To Expiration</link:label>
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    <link:label id="lab_ptv_OperatingLossCarryforwardsNotSubjectToExpirationMember_documentation_en-US" xlink:label="lab_ptv_OperatingLossCarryforwardsNotSubjectToExpirationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Loss Carryforwards Not Subject To Expiration</link:label>
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    <link:label id="lab_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_bd24e223-0851-46b4-bcc8-ce29b2f41f39_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of changes in fair value measurement, assets [abstract]</link:label>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of changes in fair value measurement, assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract"/>
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    <link:label id="lab_ptv_AkiliAndGelesisMember_b2229978-ffe3-4fb8-935f-8dc7a19fa960_terseLabel_en-US" xlink:label="lab_ptv_AkiliAndGelesisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Akili and Gelesis [Member]</link:label>
    <link:label id="lab_ptv_AkiliAndGelesisMember_label_en-US" xlink:label="lab_ptv_AkiliAndGelesisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Akili and Gelesis [Member]</link:label>
    <link:label id="lab_ptv_AkiliAndGelesisMember_documentation_en-US" xlink:label="lab_ptv_AkiliAndGelesisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Akili and Gelesis</link:label>
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    <link:label id="lab_ptv_WeightedAverageNumberOfOrdinarySharesTable_8796701a-2f6a-4bc0-8cd3-a76379174592_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageNumberOfOrdinarySharesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average number of ordinary shares [Table]</link:label>
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    <link:label id="lab_ptv_WeightedAverageNumberOfOrdinarySharesTable_documentation_en-US" xlink:label="lab_ptv_WeightedAverageNumberOfOrdinarySharesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average number of ordinary shares</link:label>
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    <link:label id="lab_ifrs-full_RightofuseAssetsMember_a28defa5-cf44-414b-b8e7-993ae7fceed8_terseLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ROU asset</link:label>
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    <link:label id="lab_ifrs-full_LongtermBorrowings_3014216c-5315-49ed-a5ba-aeb1186c6cca_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_label_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current portion of non-current borrowings</link:label>
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    <link:label id="lab_ptv_ClassBCommonMember_967f43b9-1aae-4936-8c9b-6fc7923c39b1_terseLabel_en-US" xlink:label="lab_ptv_ClassBCommonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class B Common [Member]</link:label>
    <link:label id="lab_ptv_ClassBCommonMember_label_en-US" xlink:label="lab_ptv_ClassBCommonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class B Common [Member]</link:label>
    <link:label id="lab_ptv_ClassBCommonMember_documentation_en-US" xlink:label="lab_ptv_ClassBCommonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class B Common</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ClassBCommonMember" xlink:to="lab_ptv_ClassBCommonMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentExpenseCategoryAxis_5b6ef7ea-874b-4d68-8584-09efb9bcb688_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpenseCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Expense Category [Axis]</link:label>
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    <link:label id="lab_ptv_ShareBasedPaymentExpenseCategoryAxis_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpenseCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Expense Category</link:label>
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    <link:label id="lab_ifrs-full_InvestmentsInAssociates_ad874812-067a-40f6-a85a-88f8a58b025b_terseLabel_en-US" xlink:label="lab_ifrs-full_InvestmentsInAssociates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in associates</link:label>
    <link:label id="lab_ifrs-full_InvestmentsInAssociates_c749c087-efc0-4711-917e-0e2fbb6b04f5_periodStartLabel_en-US" xlink:label="lab_ifrs-full_InvestmentsInAssociates" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">As of period start</link:label>
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    <link:label id="lab_ifrs-full_InvestmentsInAssociates_label_en-US" xlink:label="lab_ifrs-full_InvestmentsInAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in associates reported in separate financial statements</link:label>
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    <link:label id="lab_ptv_DistributionToTalShareholders_8935863a-36de-43d7-85d2-d89bdc86f6a3_terseLabel_en-US" xlink:label="lab_ptv_DistributionToTalShareholders" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distribution to Tal shareholders</link:label>
    <link:label id="lab_ptv_DistributionToTalShareholders_label_en-US" xlink:label="lab_ptv_DistributionToTalShareholders" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distribution to Tal Shareholders</link:label>
    <link:label id="lab_ptv_DistributionToTalShareholders_documentation_en-US" xlink:label="lab_ptv_DistributionToTalShareholders" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distribution to Tal Shareholders</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DistributionToTalShareholders" xlink:href="ptv-20211231.xsd#ptv_DistributionToTalShareholders"/>
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    <link:label id="lab_ifrs-full_DisclosureOfOtherAssetsExplanatory_9ef89342-6586-4d69-9f47-f272b1f06568_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Financial Assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOtherAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other assets [text block]</link:label>
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    <link:label id="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd_d36beb58-6e18-4a0f-8486-b4a8b1c036b6_terseLabel_en-US" xlink:label="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue recognized on deferred revenue outstanding at prior year end</link:label>
    <link:label id="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd_label_en-US" xlink:label="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue recognized on deferred revenue outstanding at prior year end</link:label>
    <link:label id="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd_documentation_en-US" xlink:label="lab_ptv_RevenueRecognizedOnDeferredRevenueOutstandingAtPriorYearEnd" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue recognized on deferred revenue outstanding at prior year end</link:label>
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    <link:label id="lab_ptv_NewStandardsAndInterpretationsNotYetAdoptedAbstract_label_en-US" xlink:label="lab_ptv_NewStandardsAndInterpretationsNotYetAdoptedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Standards and Interpretations Not Yet Adopted [Abstract]</link:label>
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    <link:label id="lab_ptv_AdjustmentsForIncreaseDecreaseInDeferredRevenue_d7d4af0f-fa0c-4f0b-b44a-c2df4bf846c2_terseLabel_en-US" xlink:label="lab_ptv_AdjustmentsForIncreaseDecreaseInDeferredRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenues</link:label>
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    <link:label id="lab_ptv_OutsideInvestorsMember_46211a12-b749-4c0c-8f07-024373ea025b_terseLabel_en-US" xlink:label="lab_ptv_OutsideInvestorsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outside investors</link:label>
    <link:label id="lab_ptv_OutsideInvestorsMember_label_en-US" xlink:label="lab_ptv_OutsideInvestorsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outside investors [Member]</link:label>
    <link:label id="lab_ptv_OutsideInvestorsMember_documentation_en-US" xlink:label="lab_ptv_OutsideInvestorsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outside investors</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OutsideInvestorsMember" xlink:href="ptv-20211231.xsd#ptv_OutsideInvestorsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OutsideInvestorsMember" xlink:to="lab_ptv_OutsideInvestorsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_d24a799f-39c0-48a4-afe6-d1ce95e66854_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impairment</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for impairment of non-financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"/>
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    <link:label id="lab_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets_27000220-ea13-4c34-9070-fd5a107df7bf_terseLabel_en-US" xlink:label="lab_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Information about credit quality of neither past due nor impaired financial assets</link:label>
    <link:label id="lab_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets_label_en-US" xlink:label="lab_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Information about credit quality of neither past due nor impaired financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets" xlink:to="lab_ifrs-full_InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MaximumMember_26cfdc47-875a-495d-8512-6dd4f41a011e_terseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_srt_MaximumMember_label_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember" xlink:to="lab_srt_MaximumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ResTORbioMember_418f84f7-6c49-4c95-8e1a-d10be0d3f5fa_terseLabel_en-US" xlink:label="lab_ptv_ResTORbioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">resTORbio [Member]</link:label>
    <link:label id="lab_ptv_ResTORbioMember_label_en-US" xlink:label="lab_ptv_ResTORbioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">resTORbio [Member]</link:label>
    <link:label id="lab_ptv_ResTORbioMember_documentation_en-US" xlink:label="lab_ptv_ResTORbioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">resTORbio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ResTORbioMember" xlink:href="ptv-20211231.xsd#ptv_ResTORbioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ResTORbioMember" xlink:to="lab_ptv_ResTORbioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AddressTypeDomain_bb8649c7-04c4-4c53-9612-ded7054e0a1e_terseLabel_en-US" xlink:label="lab_dei_AddressTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Address Type [Domain]</link:label>
    <link:label id="lab_dei_AddressTypeDomain_label_en-US" xlink:label="lab_dei_AddressTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Address Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AddressTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AddressTypeDomain" xlink:to="lab_dei_AddressTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates_41231581-ec26-42bd-a5c5-fa6dce93517b_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:to="lab_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_489cf3c0-2df4-4a59-b4ea-21af3e84a7d5_terseLabel_en-US" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of net income/(loss) of associates accounted for using the equity method</link:label>
    <link:label id="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_0d3bf86f-2ccf-4d43-a559-384316fd6e52_verboseLabel_en-US" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of associate loss allocated to long-term interest (please refer to Note 5)</link:label>
    <link:label id="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of profit (loss) of associates and joint ventures accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AssociateCommonStockHeldAtFairValue_aa3942dd-bf04-4725-85db-1fad2afdaacf_terseLabel_en-US" xlink:label="lab_ptv_AssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Associate common stock held at fair value</link:label>
    <link:label id="lab_ptv_AssociateCommonStockHeldAtFairValue_label_en-US" xlink:label="lab_ptv_AssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Associate common stock held at fair value</link:label>
    <link:label id="lab_ptv_AssociateCommonStockHeldAtFairValue_documentation_en-US" xlink:label="lab_ptv_AssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Associate common stock held at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AssociateCommonStockHeldAtFairValue" xlink:href="ptv-20211231.xsd#ptv_AssociateCommonStockHeldAtFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AssociateCommonStockHeldAtFairValue" xlink:to="lab_ptv_AssociateCommonStockHeldAtFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeTaxesPaidRefund_6e4f2d27-0e64-49b2-b0a8-d86f9eeea2ec_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for income taxes</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxesPaidRefund_label_en-US" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income taxes paid (refund)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefund" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncomeTaxesPaidRefund"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeTaxesPaidRefund" xlink:to="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IntraGroupEliminationsMember_dea825fa-2706-4b19-8bc8-f89e414b2493_terseLabel_en-US" xlink:label="lab_ptv_IntraGroupEliminationsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intra-group eliminations</link:label>
    <link:label id="lab_ptv_IntraGroupEliminationsMember_label_en-US" xlink:label="lab_ptv_IntraGroupEliminationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intra-group eliminations [Member]</link:label>
    <link:label id="lab_ptv_IntraGroupEliminationsMember_documentation_en-US" xlink:label="lab_ptv_IntraGroupEliminationsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intra-group eliminations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IntraGroupEliminationsMember" xlink:href="ptv-20211231.xsd#ptv_IntraGroupEliminationsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IntraGroupEliminationsMember" xlink:to="lab_ptv_IntraGroupEliminationsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ExpenseInRespectOfRSULiabilityAward_e59c67c3-9858-49ad-8d0f-f7ffbe6d8552_terseLabel_en-US" xlink:label="lab_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense in respect of RSU liability award</link:label>
    <link:label id="lab_ptv_ExpenseInRespectOfRSULiabilityAward_label_en-US" xlink:label="lab_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense in respect of RSU liability award</link:label>
    <link:label id="lab_ptv_ExpenseInRespectOfRSULiabilityAward_documentation_en-US" xlink:label="lab_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense in respect of RSU liability award</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:href="ptv-20211231.xsd#ptv_ExpenseInRespectOfRSULiabilityAward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:to="lab_ptv_ExpenseInRespectOfRSULiabilityAward" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsGrantedTable_e206cdff-8d18-43d4-aa35-07d1494f3547_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsGrantedTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average [Table]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsGrantedTable_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsGrantedTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options granted [Table]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsGrantedTable_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsGrantedTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsGrantedTable" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsGrantedTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageOptionsGrantedTable" xlink:to="lab_ptv_WeightedAverageOptionsGrantedTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions_9b40fccb-cb9a-480d-a917-a0988d2a0911_terseLabel_en-US" xlink:label="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revaluation of deferred tax assets related&#160;to&#160;share-based&#160;awards</link:label>
    <link:label id="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions_label_en-US" xlink:label="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decrease (increase) through tax on share-based payment transactions, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions"/>
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    <link:label id="lab_ptv_ExercisePriceMeasurementInputMember_2ba1412a-f9bc-4101-9743-43d86fa673e2_terseLabel_en-US" xlink:label="lab_ptv_ExercisePriceMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price of the warrants</link:label>
    <link:label id="lab_ptv_ExercisePriceMeasurementInputMember_label_en-US" xlink:label="lab_ptv_ExercisePriceMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price, measurement input [Member]</link:label>
    <link:label id="lab_ptv_ExercisePriceMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_ExercisePriceMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price, measurement input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExercisePriceMeasurementInputMember" xlink:href="ptv-20211231.xsd#ptv_ExercisePriceMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ExercisePriceMeasurementInputMember" xlink:to="lab_ptv_ExercisePriceMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentAbstract_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PropertyPlantAndEquipmentAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentAbstract" xlink:to="lab_ifrs-full_PropertyPlantAndEquipmentAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_af24f8cb-dd80-4a8b-9a6f-f8dfab9f9542_terseLabel_en-US" xlink:label="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deductible Temporary Difference</link:label>
    <link:label id="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_label_en-US" xlink:label="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deductible temporary differences for which no deferred tax asset is recognised</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised"/>
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    <link:label id="lab_dei_CityAreaCode_468afcee-9c13-4401-b049-153a4221f44d_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">City Area Code</link:label>
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    <link:label id="lab_ptv_TimeToLiquidityMeasurementInputMember_f1f28b8a-1db2-4094-a186-c99b5016d66b_terseLabel_en-US" xlink:label="lab_ptv_TimeToLiquidityMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time to Liquidity</link:label>
    <link:label id="lab_ptv_TimeToLiquidityMeasurementInputMember_label_en-US" xlink:label="lab_ptv_TimeToLiquidityMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time to Liquidity, measurement input [Member]</link:label>
    <link:label id="lab_ptv_TimeToLiquidityMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_TimeToLiquidityMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time to Liquidity, measurement input</link:label>
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    <link:label id="lab_ptv_Over10PercentOfRevenueMember_83372368-a55f-48f9-8b7e-825526806546_terseLabel_en-US" xlink:label="lab_ptv_Over10PercentOfRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Over 10 percent of revenue</link:label>
    <link:label id="lab_ptv_Over10PercentOfRevenueMember_label_en-US" xlink:label="lab_ptv_Over10PercentOfRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Over 10 percent of revenue [Member]</link:label>
    <link:label id="lab_ptv_Over10PercentOfRevenueMember_documentation_en-US" xlink:label="lab_ptv_Over10PercentOfRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Over 10 percent of revenue</link:label>
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    <link:label id="lab_ifrs-full_PurchaseOfInterestsInAssociates_5ac4ac9c-fb93-4582-ae63-f7594b827484_verboseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfInterestsInAssociates" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash purchase of preferred shares</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfInterestsInAssociates_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfInterestsInAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of interests in associates</link:label>
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    <link:label id="lab_ifrs-full_RevenueFromRoyalties_b20c410d-3e9f-4a07-adf3-89a74513031f_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueFromRoyalties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty income</link:label>
    <link:label id="lab_ifrs-full_RevenueFromRoyalties_label_en-US" xlink:label="lab_ifrs-full_RevenueFromRoyalties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromRoyalties" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RevenueFromRoyalties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueFromRoyalties" xlink:to="lab_ifrs-full_RevenueFromRoyalties" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_57771b68-11e9-4604-a406-63320115f12a_verboseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of associate preferred shares held at fair value</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_901b8e9f-8522-40ea-96ca-f76467b7d113_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of investments other than investments accounted for using equity method</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of investments other than investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement_8cf5351c-c732-442d-ad3b-b5f8f8ed14a6_periodStartLabel_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value, RSU outstanding beginning balance (in GBP per share)</link:label>
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    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement_label_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value of other equity instruments outstanding in share-based payment arrangement</link:label>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement_documentation_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value of other equity instruments outstanding in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:to="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PerformanceSharePlanTable_0fc9711a-6aab-4216-b07b-75ca6db891ac_terseLabel_en-US" xlink:label="lab_ptv_PerformanceSharePlanTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan [Table]</link:label>
    <link:label id="lab_ptv_PerformanceSharePlanTable_label_en-US" xlink:label="lab_ptv_PerformanceSharePlanTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan [Table]</link:label>
    <link:label id="lab_ptv_PerformanceSharePlanTable_documentation_en-US" xlink:label="lab_ptv_PerformanceSharePlanTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PerformanceSharePlanTable" xlink:href="ptv-20211231.xsd#ptv_PerformanceSharePlanTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PerformanceSharePlanTable" xlink:to="lab_ptv_PerformanceSharePlanTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock_199c170a-202f-4821-93e8-3ddc9f13ad7d_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of changes in Financial Liabilities, level 3 fair value - Subsidiary Preferred Shares and Convertible Notes</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock" xlink:to="lab_ptv_DisclosureOfChangesInFinancialLiabilitiesLevel3FairValueSubsidiaryPreferredSharesAndConvertibleNotesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_5aec97e1-483e-459a-8700-5090be25448c_totalLabel_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity attributable to the owners of the Company</link:label>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_2726e0b2-f97f-4b76-b62c-8564fe53e787_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity attributable to owners of the Group</link:label>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_label_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
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    <link:label id="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock_018735b7-28b9-4c5f-8fbc-d9c52eb0f681_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Accumulated amortization</link:label>
    <link:label id="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Accumulated amortization [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfAccumulatedAmortizationTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Accumulated amortization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfAccumulatedAmortizationTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfAccumulatedAmortizationTextBlock"/>
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    <link:label id="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract_63ae81a3-26ba-4456-9e38-22bc64e90ab2_terseLabel_en-US" xlink:label="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Supplemental disclosure of non-cash investment and financing activities:</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:href="ptv-20211231.xsd#ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract"/>
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    <link:label id="lab_ptv_SummaryOfEquityTextBlock_4624c4b9-7bfc-4e1c-aa76-bf6705145c33_terseLabel_en-US" xlink:label="lab_ptv_SummaryOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Equity</link:label>
    <link:label id="lab_ptv_SummaryOfEquityTextBlock_label_en-US" xlink:label="lab_ptv_SummaryOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Equity [Text Block]</link:label>
    <link:label id="lab_ptv_SummaryOfEquityTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Equity</link:label>
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    <link:label id="lab_ptv_RelatedPartyTransactionsTable_label_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions [Table]</link:label>
    <link:label id="lab_ptv_RelatedPartyTransactionsTable_documentation_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RelatedPartyTransactionsTable" xlink:href="ptv-20211231.xsd#ptv_RelatedPartyTransactionsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RelatedPartyTransactionsTable" xlink:to="lab_ptv_RelatedPartyTransactionsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentsMember_85c3cb5c-3117-4f15-a066-677a24268359_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payments</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsMember_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payments [Member]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsMember_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentsMember" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentsMember" xlink:to="lab_ptv_ShareBasedPaymentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions_8dde608d-e465-4ce3-9e58-de3faa87f314_terseLabel_en-US" xlink:label="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Liabilities From Share based Payment Transactions</link:label>
    <link:label id="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions_label_en-US" xlink:label="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Liabilities From Share based Payment Transactions</link:label>
    <link:label id="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions_documentation_en-US" xlink:label="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Liabilities From Share based Payment Transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:href="ptv-20211231.xsd#ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:to="lab_ptv_CurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_45677a5a-b066-426e-ad2c-c9fd686e4a6f_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalPeriodFocus" xlink:to="lab_dei_DocumentFiscalPeriodFocus" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinancialInstrumentsWarrantsTable_556b8fc9-c9e6-418b-843b-36eafd5ca9e4_terseLabel_en-US" xlink:label="lab_ptv_FinancialInstrumentsWarrantsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments - Warrants [Table]</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsWarrantsTable_label_en-US" xlink:label="lab_ptv_FinancialInstrumentsWarrantsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments - Warrants [Table]</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsWarrantsTable_documentation_en-US" xlink:label="lab_ptv_FinancialInstrumentsWarrantsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments - Warrants [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinancialInstrumentsWarrantsTable" xlink:href="ptv-20211231.xsd#ptv_FinancialInstrumentsWarrantsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinancialInstrumentsWarrantsTable" xlink:to="lab_ptv_FinancialInstrumentsWarrantsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentsAbstract_b2cccbc8-857c-4931-89ca-33aeed573a73_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Expense [Abstract]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsAbstract_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments [Abstract]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsAbstract_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentsAbstract" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentsAbstract" xlink:to="lab_ptv_ShareBasedPaymentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ForeignMember_6907641b-ab66-4c15-b8db-9c66eb3bf547_terseLabel_en-US" xlink:label="lab_ptv_ForeignMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign [Member]</link:label>
    <link:label id="lab_ptv_ForeignMember_label_en-US" xlink:label="lab_ptv_ForeignMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign [Member]</link:label>
    <link:label id="lab_ptv_ForeignMember_documentation_en-US" xlink:label="lab_ptv_ForeignMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ForeignMember" xlink:href="ptv-20211231.xsd#ptv_ForeignMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ForeignMember" xlink:to="lab_ptv_ForeignMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_f3551fe2-216a-4d92-880a-65960adc04ae_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets (liabilities), net</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liability (asset)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DeferredTaxLiabilityAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:to="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock_78d31234-0338-415f-bd05-5a9d089d1092_terseLabel_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments, Significant Unobservable inputs, level 3 fair value - Preferred Shares liability</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock_label_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments, Significant Unobservable inputs, level 3 fair value - Preferred Shares liability [Text Block]</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock_documentation_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments, Significant Unobservable inputs, level 3 fair value - Preferred Shares liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:href="ptv-20211231.xsd#ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:to="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsLevel3FairValuePreferredSharesLiabilityTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsInterestRate_0e3bc176-c481-47bd-86e2-2742f7a14b1c_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, interest rate</link:label>
    <link:label id="lab_ifrs-full_BorrowingsInterestRate_label_en-US" xlink:label="lab_ifrs-full_BorrowingsInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, interest rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsInterestRate" xlink:to="lab_ifrs-full_BorrowingsInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationPropertyPlantAndEquipment_f4fa67cd-c896-4dae-a2fa-253a4bfe71f1_terseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_ifrs-full_DepreciationPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable_db1931b7-de7e-4b18-bc12-a77c67b6bc7a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AppeeringMember_76e1ea67-e18f-42a9-b3ba-0a6d6ab51d56_verboseLabel_en-US" xlink:label="lab_ptv_AppeeringMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Appeering Inc.</link:label>
    <link:label id="lab_ptv_AppeeringMember_5eac4801-c091-463b-ab87-50329f3de0b8_terseLabel_en-US" xlink:label="lab_ptv_AppeeringMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Appeering</link:label>
    <link:label id="lab_ptv_AppeeringMember_label_en-US" xlink:label="lab_ptv_AppeeringMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Appeering [Member]</link:label>
    <link:label id="lab_ptv_AppeeringMember_documentation_en-US" xlink:label="lab_ptv_AppeeringMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Appeering</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AppeeringMember" xlink:href="ptv-20211231.xsd#ptv_AppeeringMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AppeeringMember" xlink:to="lab_ptv_AppeeringMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NontradingHoldingCompaniesMember_c4c5e5c4-a8a9-485b-b33e-6119ba101104_terseLabel_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading Holding Companies [Member]</link:label>
    <link:label id="lab_ptv_NontradingHoldingCompaniesMember_label_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading Holding Companies [Member]</link:label>
    <link:label id="lab_ptv_NontradingHoldingCompaniesMember_documentation_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading Holding Companies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NontradingHoldingCompaniesMember" xlink:href="ptv-20211231.xsd#ptv_NontradingHoldingCompaniesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NontradingHoldingCompaniesMember" xlink:to="lab_ptv_NontradingHoldingCompaniesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OperatingSegmentsMember_6f076526-f2cf-4533-bd32-10fc3b920f5d_terseLabel_en-US" xlink:label="lab_ifrs-full_OperatingSegmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating segments [member]</link:label>
    <link:label id="lab_ifrs-full_OperatingSegmentsMember_label_en-US" xlink:label="lab_ifrs-full_OperatingSegmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating segments [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OperatingSegmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OperatingSegmentsMember" xlink:to="lab_ifrs-full_OperatingSegmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_7b8548e2-a39c-478e-85d6-6f2e85fc1082_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term employee benefits</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key management personnel compensation, short-term employee benefits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits"/>
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    <link:label id="lab_ifrs-full_SharePremiumMember_536a2630-538e-43e1-8843-36bc617b64c2_terseLabel_en-US" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share premium [member]</link:label>
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    <link:label id="lab_ptv_PureTechLYTMember_70f84a50-63e5-47ed-953b-e2d740e666bc_verboseLabel_en-US" xlink:label="lab_ptv_PureTechLYTMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech LYT (formerly Ariya Therapeutics, Inc.)</link:label>
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    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_8bc00963-e856-4402-bc79-9cdae9e6a693_verboseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercised (in shares)</link:label>
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    <link:label id="lab_ptv_EarningsLossPerShareLineItems_929648b8-dae3-4216-acf9-aa6e46a69ed5_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossPerShareLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Loss per Share [Line Items]</link:label>
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    <link:label id="lab_ifrs-full_SalesFairValueMeasurementAssets_95d3bd9b-43db-4605-96e2-d35af71d86a9_terseLabel_en-US" xlink:label="lab_ifrs-full_SalesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of shares</link:label>
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    <link:label id="lab_ptv_ConvertibleNotesLineItems_documentation_en-US" xlink:label="lab_ptv_ConvertibleNotesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes</link:label>
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    <link:label id="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsOutstandingTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsOutstandingTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Weighted Average Exercise Prices for Options Outstanding</link:label>
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    <link:label id="lab_srt_RepurchaseAgreementCounterpartyNameDomain_6e7ad22a-526f-4d46-9fed-674c5e88f802_terseLabel_en-US" xlink:label="lab_srt_RepurchaseAgreementCounterpartyNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparty Name [Domain]</link:label>
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    <link:label id="lab_ifrs-full_FixturesAndFittingsMember_b3fe474d-cf73-4312-a237-d5ec48b761e2_terseLabel_en-US" xlink:label="lab_ifrs-full_FixturesAndFittingsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Furniture and fixtures</link:label>
    <link:label id="lab_ifrs-full_FixturesAndFittingsMember_label_en-US" xlink:label="lab_ifrs-full_FixturesAndFittingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fixtures and fittings [member]</link:label>
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    <link:label id="lab_dei_DocumentRegistrationStatement_4997a58b-d630-448b-971f-bda07e3af44e_terseLabel_en-US" xlink:label="lab_dei_DocumentRegistrationStatement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Registration Statement</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentRegistrationStatement" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentRegistrationStatement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentRegistrationStatement" xlink:to="lab_dei_DocumentRegistrationStatement" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BasicMember_e543e09b-3286-4e47-8592-1d8cda71626f_terseLabel_en-US" xlink:label="lab_ptv_BasicMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic [Member]</link:label>
    <link:label id="lab_ptv_BasicMember_label_en-US" xlink:label="lab_ptv_BasicMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic [Member]</link:label>
    <link:label id="lab_ptv_BasicMember_documentation_en-US" xlink:label="lab_ptv_BasicMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BasicMember" xlink:href="ptv-20211231.xsd#ptv_BasicMember"/>
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    <link:label id="lab_ptv_DiscountConversionFromNotesNonQualifiedFinancing_660e6cd5-9ef0-45ff-8b7f-939db5960133_terseLabel_en-US" xlink:label="lab_ptv_DiscountConversionFromNotesNonQualifiedFinancing" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount, conversion from notes - non qualified financing</link:label>
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    <link:label id="lab_ptv_DiscountConversionFromNotesNonQualifiedFinancing_documentation_en-US" xlink:label="lab_ptv_DiscountConversionFromNotesNonQualifiedFinancing" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount, conversion from notes - non qualified financing</link:label>
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    <link:label id="lab_ifrs-full_FinancialAssetsMember_07b493f3-5a98-46bf-8b7a-3489c76153bc_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, class [member]</link:label>
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    <link:label id="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived_93c586bf-d5fa-4f19-b319-631ea939b695_terseLabel_en-US" xlink:label="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Undiscounted operating lease payments to be received</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis_85402c94-2492-4c3e-9279-69dd30b0805c_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial liabilities [axis]</link:label>
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    <link:label id="lab_ptv_InvestmentsInAssociatesMember_d20f385e-956c-42e8-a309-a7c065f37eb6_terseLabel_en-US" xlink:label="lab_ptv_InvestmentsInAssociatesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment in Associates</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory_6727767e-def6-48b6-a3bc-29d909959cb5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of revenue from contracts with customers</link:label>
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    <link:label id="lab_dei_AuditorLocation_0c4ea64c-6909-480e-bd2d-7001dcf9ad78_terseLabel_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditor Location</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLocation" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AuditorLocation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorLocation" xlink:to="lab_dei_AuditorLocation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities_9ab3db1c-3d88-4fc1-8d06-08ecdadaef76_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Liability Increase/ (Decrease)</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_b75f96e4-7354-4254-be50-368b0e192c14_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts receivable</link:label>
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    <link:label id="lab_ptv_FairValueInputCommonStockPrice_10a99e6d-11ea-4476-8b5b-e8230822c468_terseLabel_en-US" xlink:label="lab_ptv_FairValueInputCommonStockPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value input, common stock price</link:label>
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    <link:label id="lab_ptv_FairValueInputCommonStockPrice_documentation_en-US" xlink:label="lab_ptv_FairValueInputCommonStockPrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Input, Common Stock Price</link:label>
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    <link:label id="lab_dei_BusinessContactMember_dc44d2e5-ed38-4797-a194-a713637a8a2c_terseLabel_en-US" xlink:label="lab_dei_BusinessContactMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Contact</link:label>
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    <link:label id="lab_ifrs-full_EquityPriceRiskMember_1eb27bfb-016a-4073-902e-116e18ef9168_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityPriceRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity price risk [member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityPriceRiskMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EquityPriceRiskMember"/>
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    <link:label id="lab_ptv_CustomerEMember_d618d51a-0aef-4a75-ab1e-99fc0cdf6c92_terseLabel_en-US" xlink:label="lab_ptv_CustomerEMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer E</link:label>
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    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities_2493d562-34c7-495b-8cdf-9384d6e14ca3_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants_b5a39d9c-3eb9-46d7-9909-6e7181fde4ab_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Grant Income</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_8b736265-6041-478e-b013-60f8ca68c2d3_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember_66d7f524-3e09-41b7-9a80-b1d0023542cb_terseLabel_en-US" xlink:label="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina and Ms Mary LaMattina</link:label>
    <link:label id="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember_label_en-US" xlink:label="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina and Ms Mary LaMattina [Member]</link:label>
    <link:label id="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember_documentation_en-US" xlink:label="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina and Ms Mary LaMattina</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:href="ptv-20211231.xsd#ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:to="lab_ptv_DrJohnLaMattinaAndMsMaryLaMattinaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_d3bf3ff8-6fd7-4231-a87a-1e63ee2a37d2_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of risks [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of risks [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfRisksAxis" xlink:to="lab_ifrs-full_TypesOfRisksAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives_c20a8937-9b38-4252-845f-63f792296396_terseLabel_en-US" xlink:label="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements purchased through lease incentives (deducted from Right of Use Asset)</link:label>
    <link:label id="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives_label_en-US" xlink:label="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements purchased through lease incentives</link:label>
    <link:label id="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives_documentation_en-US" xlink:label="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements purchased through lease incentives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:href="ptv-20211231.xsd#ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:to="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentsTableTable_9e319f66-e55c-4389-854e-356d1835fc5f_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table [Table]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsTableTable_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table [Table]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentsTableTable_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentsTableTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments Table [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentsTableTable" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentsTableTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentsTableTable" xlink:to="lab_ptv_ShareBasedPaymentsTableTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions_f5a11d37-e664-4d92-9a4a-c08c4c463b47_terseLabel_en-US" xlink:label="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of non controlling interest in consideration for issuance of shares and options</link:label>
    <link:label id="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions_label_en-US" xlink:label="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of non controlling interest in consideration for issuance of shares and options</link:label>
    <link:label id="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions_documentation_en-US" xlink:label="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of non controlling interest in consideration for issuance of shares and options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:href="ptv-20211231.xsd#ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:to="lab_ptv_PurchaseOfNonControllingInterestInConsiderationForIssuanceOfSharesAndOptions" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProceedsFromIssueOfSharesToNCI_9bcdb5d0-674b-4989-ac30-58f3dec99246_terseLabel_en-US" xlink:label="lab_ptv_ProceedsFromIssueOfSharesToNCI" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of shares to NCI in subsidiary</link:label>
    <link:label id="lab_ptv_ProceedsFromIssueOfSharesToNCI_label_en-US" xlink:label="lab_ptv_ProceedsFromIssueOfSharesToNCI" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds From Issue Of shares to NCI</link:label>
    <link:label id="lab_ptv_ProceedsFromIssueOfSharesToNCI_documentation_en-US" xlink:label="lab_ptv_ProceedsFromIssueOfSharesToNCI" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds From Issue Of shares to NCI</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProceedsFromIssueOfSharesToNCI" xlink:href="ptv-20211231.xsd#ptv_ProceedsFromIssueOfSharesToNCI"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProceedsFromIssueOfSharesToNCI" xlink:to="lab_ptv_ProceedsFromIssueOfSharesToNCI" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_333bca78-ce34-4bb4-9447-12e976ce6dc4_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:to="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PreferredDSharesMember_86d69edb-5f4c-4cca-9666-468c51109c9a_terseLabel_en-US" xlink:label="lab_ptv_PreferredDSharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred D shares</link:label>
    <link:label id="lab_ptv_PreferredDSharesMember_label_en-US" xlink:label="lab_ptv_PreferredDSharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred D shares [Member]</link:label>
    <link:label id="lab_ptv_PreferredDSharesMember_documentation_en-US" xlink:label="lab_ptv_PreferredDSharesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred D shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PreferredDSharesMember" xlink:href="ptv-20211231.xsd#ptv_PreferredDSharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PreferredDSharesMember" xlink:to="lab_ptv_PreferredDSharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CustomerCMember_f7da2a7b-69e0-4cf4-8560-58a7ae80c46b_terseLabel_en-US" xlink:label="lab_ptv_CustomerCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer C</link:label>
    <link:label id="lab_ptv_CustomerCMember_label_en-US" xlink:label="lab_ptv_CustomerCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer C [Member]</link:label>
    <link:label id="lab_ptv_CustomerCMember_documentation_en-US" xlink:label="lab_ptv_CustomerCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CustomerCMember" xlink:href="ptv-20211231.xsd#ptv_CustomerCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CustomerCMember" xlink:to="lab_ptv_CustomerCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of average effective tax rate and applicable tax rate [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract" xlink:to="lab_ifrs-full_ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OtherResearchAndDevelopmentExpense_c1812479-a2a5-4a54-a8d8-1bdca09eb934_terseLabel_en-US" xlink:label="lab_ptv_OtherResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other research and development expenses</link:label>
    <link:label id="lab_ptv_OtherResearchAndDevelopmentExpense_label_en-US" xlink:label="lab_ptv_OtherResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Research And Development Expense</link:label>
    <link:label id="lab_ptv_OtherResearchAndDevelopmentExpense_documentation_en-US" xlink:label="lab_ptv_OtherResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Research And Development Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OtherResearchAndDevelopmentExpense" xlink:href="ptv-20211231.xsd#ptv_OtherResearchAndDevelopmentExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OtherResearchAndDevelopmentExpense" xlink:to="lab_ptv_OtherResearchAndDevelopmentExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems_cfd29910-57aa-4563-9ed0-93a0d1ec3606_terseLabel_en-US" xlink:label="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognized deferred tax assets [Line Items]</link:label>
    <link:label id="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems_label_en-US" xlink:label="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognized deferred tax assets [Line Items]</link:label>
    <link:label id="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems_documentation_en-US" xlink:label="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognized deferred tax assets [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:href="ptv-20211231.xsd#ptv_UnrecognizedDeferredTaxAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:to="lab_ptv_UnrecognizedDeferredTaxAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionToPreferred_fe4c7ec3-a712-4084-868b-4fec76e15c7e_terseLabel_en-US" xlink:label="lab_ptv_ConversionToPreferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to preferred</link:label>
    <link:label id="lab_ptv_ConversionToPreferred_label_en-US" xlink:label="lab_ptv_ConversionToPreferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to preferred</link:label>
    <link:label id="lab_ptv_ConversionToPreferred_documentation_en-US" xlink:label="lab_ptv_ConversionToPreferred" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to preferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionToPreferred" xlink:href="ptv-20211231.xsd#ptv_ConversionToPreferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConversionToPreferred" xlink:to="lab_ptv_ConversionToPreferred" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets_f28a70cf-618e-4e8f-aa6a-c093cea9a881_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized gain &#8211; fair value through profit and loss</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) in fair value measurement, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets" xlink:to="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NetDeferredTaxAssetsNotRecognised_80ad0da8-a0ba-47cf-b8fb-e6d11f9c9f06_terseLabel_en-US" xlink:label="lab_ptv_NetDeferredTaxAssetsNotRecognised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets (liabilities), net, not recognized</link:label>
    <link:label id="lab_ptv_NetDeferredTaxAssetsNotRecognised_9744b8c6-edeb-49e6-868a-a883eb1b2407_totalLabel_en-US" xlink:label="lab_ptv_NetDeferredTaxAssetsNotRecognised" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ptv_NetDeferredTaxAssetsNotRecognised_label_en-US" xlink:label="lab_ptv_NetDeferredTaxAssetsNotRecognised" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net deferred tax assets, not recognised</link:label>
    <link:label id="lab_ptv_NetDeferredTaxAssetsNotRecognised_documentation_en-US" xlink:label="lab_ptv_NetDeferredTaxAssetsNotRecognised" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net deferred tax assets, not recognised</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NetDeferredTaxAssetsNotRecognised" xlink:href="ptv-20211231.xsd#ptv_NetDeferredTaxAssetsNotRecognised"/>
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    <link:label id="lab_ptv_PayrollTaxes_documentation_en-US" xlink:label="lab_ptv_PayrollTaxes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payroll Taxes</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives_50fa5de2-f4fb-49b5-b000-a7b5c5674f9b_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value gain on derivative</link:label>
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    <link:label id="lab_ifrs-full_GeographicalAreasMember_82ab9692-949b-4b20-b865-ba89b1b87a81_terseLabel_en-US" xlink:label="lab_ifrs-full_GeographicalAreasMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Geographical areas [member]</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_d6640be8-df36-4369-ad06-d62be18eb48f_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition of subsidiary non-controlling interest</link:label>
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    <link:label id="lab_ptv_ScheduleOfNotesPayableTextBlock_c6c7e181-7752-4a10-b995-e866252a8b5d_terseLabel_en-US" xlink:label="lab_ptv_ScheduleOfNotesPayableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Notes Payable</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems_fe8a7ad8-b17c-457c-9b9a-5b9ee53625c9_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of operating segments [line items]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory_056001b3-bd3e-4b97-b8f7-bd6ede80e794_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key Management Personnel Compensation</link:label>
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    <link:label id="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent_e8b4e85e-5587-4b4d-9b5e-dd02f27887c9_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Owners of the Company</link:label>
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    <link:label id="lab_ptv_WeightedAverageRemainingContractualLifeOfOptionsExcisable_47909e12-23db-4e38-a550-5b73667a1c6b_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageRemainingContractualLifeOfOptionsExcisable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average remaining contractual life of options excisable (in years)</link:label>
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    <link:label id="lab_ptv_WeightedAverageRemainingContractualLifeOfOptionsExcisable_documentation_en-US" xlink:label="lab_ptv_WeightedAverageRemainingContractualLifeOfOptionsExcisable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average remaining contractual life of options excisable</link:label>
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    <link:label id="lab_ifrs-full_ProceedsFromIssuingShares_4150aefb-8721-49ee-b8f0-48c5cc224755_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from the issuance of shares and subsidiary preferred shares</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_a2a47c82-682b-452f-8dd9-ce5a53b3294f_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from operating activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</link:label>
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    <link:label id="lab_ptv_LiquidityRiskLineItems_label_en-US" xlink:label="lab_ptv_LiquidityRiskLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liquidity Risk [Line Items]</link:label>
    <link:label id="lab_ptv_LiquidityRiskLineItems_documentation_en-US" xlink:label="lab_ptv_LiquidityRiskLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liquidity Risk</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_130fa823-77a9-4488-a0f5-992169156308_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
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    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_0e28c7aa-337f-4bda-beba-49c78cc79713_terseLabel_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Levels of fair value hierarchy [axis]</link:label>
    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_label_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Levels of fair value hierarchy [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
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    <link:label id="lab_ptv_GainLossOnForeignCurrencyExchangeInFinanceCosts_661a27c8-0ceb-4501-af21-40deb773aa12_verboseLabel_en-US" xlink:label="lab_ptv_GainLossOnForeignCurrencyExchangeInFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(loss) on foreign currency exchange</link:label>
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    <link:label id="lab_ptv_GainLossOnForeignCurrencyExchangeInFinanceCosts_documentation_en-US" xlink:label="lab_ptv_GainLossOnForeignCurrencyExchangeInFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain Loss on foreign currency exchange in finance costs</link:label>
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    <link:label id="lab_ptv_VorMember_516bdaa8-6142-4064-9cd8-50352715249b_verboseLabel_en-US" xlink:label="lab_ptv_VorMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vor Biopharma Inc.</link:label>
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    <link:label id="lab_ptv_VorMember_label_en-US" xlink:label="lab_ptv_VorMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vor [Member]</link:label>
    <link:label id="lab_ptv_VorMember_documentation_en-US" xlink:label="lab_ptv_VorMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vor</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfFinanceLeasePaymentsReceivableExplanatory_7c566dca-a977-4cd6-ba29-ea2d0c9abbc3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfFinanceLeasePaymentsReceivableExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of finance lease payments receivable</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfFinanceLeasePaymentsReceivableExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfFinanceLeasePaymentsReceivableExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of finance lease payments receivable [text block]</link:label>
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    <link:label id="lab_ptv_NotImpairedMember_9d74a2bf-8ccc-457e-ba89-e8d13612f6f0_terseLabel_en-US" xlink:label="lab_ptv_NotImpairedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired</link:label>
    <link:label id="lab_ptv_NotImpairedMember_label_en-US" xlink:label="lab_ptv_NotImpairedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired [Member]</link:label>
    <link:label id="lab_ptv_NotImpairedMember_documentation_en-US" xlink:label="lab_ptv_NotImpairedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not impaired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NotImpairedMember" xlink:href="ptv-20211231.xsd#ptv_NotImpairedMember"/>
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    <link:label id="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss_dafa3c4d-194f-4ba4-9f51-cd96a20aff6d_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value</link:label>
    <link:label id="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss_4ab83e39-9580-48bc-885b-5855a27c4466_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss_d39a1a7d-c600-4b6f-bfa3-3c0c4e5b2605_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance after allocation of share in associate loss to long-term interest1</link:label>
    <link:label id="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current financial assets at fair value through profit or loss</link:label>
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    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets_1079e26a-f032-4a0b-a59d-a0d0d5405910_terseLabel_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Range</link:label>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets_label_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of reasonably possible increase in unobservable input, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets"/>
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    <link:label id="lab_ifrs-full_CurrentTradeReceivables_c50f2aac-3312-4d9e-b00b-2a793d409008_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other receivables</link:label>
    <link:label id="lab_ifrs-full_CurrentTradeReceivables_label_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current trade receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTradeReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentTradeReceivables"/>
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    <link:label id="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_56c92f08-f410-43a0-bdd4-0fcde2abafbc_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2024</link:label>
    <link:label id="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_378dd7f4-4ae5-467a-b289-7e76b5eb8c96_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Two to three years</link:label>
    <link:label id="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than two years and not later than three years [member]</link:label>
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    <link:label id="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossBeforeAllocationToLongTermInterest_f3db0894-eab4-4b25-924b-dbbd0511c0c2_terseLabel_en-US" xlink:label="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossBeforeAllocationToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance before allocation of share in associate loss to long-term interest</link:label>
    <link:label id="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossBeforeAllocationToLongTermInterest_label_en-US" xlink:label="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossBeforeAllocationToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets At Fair Value Through Profit Or Loss before allocation to long-term interest</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_688fe5b3-053c-4e0f-83b9-f9f017c2f5f3_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">IFRS 15, Revenue from Contracts with Customers</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for recognition of revenue [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseLiabilities_335c0c73-179d-4667-85d7-cc73408a0e57_periodStartLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at beginning of period</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilities_954f1ee5-9b42-4964-8c52-1f1499cd2cc6_periodEndLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at end of period</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilities_02a61521-1d0e-4b3d-ac4c-84e41dc5ef4d_totalLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total lease liabilities</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseLiabilities" xlink:to="lab_ifrs-full_LeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfAssetsMember_b66b8f08-6b3f-407b-9a6b-ded6ed71464a_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets [member]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfAssetsMember_label_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ClassesOfAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfAssetsMember" xlink:to="lab_ifrs-full_ClassesOfAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncontrollingInterestsMember_bc4e80ac-958a-4583-a0c2-50c56bbeb4ca_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncontrollingInterestsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-controlling interests [member]</link:label>
    <link:label id="lab_ifrs-full_NoncontrollingInterestsMember_label_en-US" xlink:label="lab_ifrs-full_NoncontrollingInterestsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-controlling interests [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NoncontrollingInterestsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncontrollingInterestsMember" xlink:to="lab_ifrs-full_NoncontrollingInterestsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsTable_49cebed0-df5e-4326-823f-4f23c4752664_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_fd0a7a70-ec64-4206-9acd-f357ae22b114_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for share-based payment transactions [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_cdd63a35-b70a-47d1-8863-8b6d2e39d6d5_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other tax effects for reconciliation between accounting profit and tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:to="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GrossAmountMember_bb6d1758-3e44-4681-83ea-aa7553d2921d_terseLabel_en-US" xlink:label="lab_ptv_GrossAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Amount</link:label>
    <link:label id="lab_ptv_GrossAmountMember_label_en-US" xlink:label="lab_ptv_GrossAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Amount [Member]</link:label>
    <link:label id="lab_ptv_GrossAmountMember_documentation_en-US" xlink:label="lab_ptv_GrossAmountMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GrossAmountMember" xlink:href="ptv-20211231.xsd#ptv_GrossAmountMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GrossAmountMember" xlink:to="lab_ptv_GrossAmountMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_8abae1c1-dc39-4fde-b823-4e04383fb62a_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net cash used in operating activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherReservesMember_7d0755cc-f55e-42cb-9e87-f2b8a308ff79_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherReservesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other reserves [member]</link:label>
    <link:label id="lab_ifrs-full_OtherReservesMember_label_en-US" xlink:label="lab_ifrs-full_OtherReservesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other reserves [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReservesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherReservesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherReservesMember" xlink:to="lab_ifrs-full_OtherReservesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_c1f01ed2-9b54-4d50-a7de-ba961ab93a1e_terseLabel_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">US federal statutory rate</link:label>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ApplicableTaxRate" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ApplicableTaxRate" xlink:to="lab_ifrs-full_ApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonControllingInterestsTable_3b2b2cde-6a2d-4f1d-b3d4-0335c5c1c215_terseLabel_en-US" xlink:label="lab_ptv_NonControllingInterestsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Table]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsTable_label_en-US" xlink:label="lab_ptv_NonControllingInterestsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Table]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsTable_documentation_en-US" xlink:label="lab_ptv_NonControllingInterestsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonControllingInterestsTable" xlink:href="ptv-20211231.xsd#ptv_NonControllingInterestsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonControllingInterestsTable" xlink:to="lab_ptv_NonControllingInterestsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_e1e96a14-c171-496f-b40d-794d1734c298_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of borrowings [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LongTermLoanAbstract_label_en-US" xlink:label="lab_ptv_LongTermLoanAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan [Abstract]</link:label>
    <link:label id="lab_ptv_LongTermLoanAbstract_documentation_en-US" xlink:label="lab_ptv_LongTermLoanAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LongTermLoanAbstract" xlink:href="ptv-20211231.xsd#ptv_LongTermLoanAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LongTermLoanAbstract" xlink:to="lab_ptv_LongTermLoanAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_e93b5754-b765-4d27-8dd0-24167206021a_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslation_a15997ba-b486-4d10-a5f2-55dad43e7e9f_terseLabel_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Translation reserve</link:label>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslation_label_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reserve of exchange differences on translation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslation" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslation" xlink:to="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslation" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionOfNoteReceivable_8522af0b-21fc-442b-bec2-15a7b98b8dd9_terseLabel_en-US" xlink:label="lab_ptv_ConversionOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of note receivable</link:label>
    <link:label id="lab_ptv_ConversionOfNoteReceivable_label_en-US" xlink:label="lab_ptv_ConversionOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of note receivable</link:label>
    <link:label id="lab_ptv_ConversionOfNoteReceivable_documentation_en-US" xlink:label="lab_ptv_ConversionOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of note receivable</link:label>
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    <link:label id="lab_ifrs-full_StatementOfChangesInEquityTable_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of changes in equity [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
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    <link:label id="lab_ifrs-full_CurrentContractLiabilities_1fc77414-fbd1-4a71-bdb4-1efabc2007b3_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_ifrs-full_CurrentContractLiabilities_fc043ec8-7f9f-44fc-b8c7-4321053fde53_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenue &#8211; short term</link:label>
    <link:label id="lab_ifrs-full_CurrentContractLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current contract liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentContractLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentContractLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentContractLiabilities" xlink:to="lab_ifrs-full_CurrentContractLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceAbstract_2336bdb0-372f-4bba-8791-000ba0cc2f1a_terseLabel_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Abstract]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceAbstract_label_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Abstract]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceAbstract_documentation_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference</link:label>
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    <link:label id="lab_ptv_RecognisedIncomeTaxExpenseTable_documentation_en-US" xlink:label="lab_ptv_RecognisedIncomeTaxExpenseTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recognised Income Tax Expense [Table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
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    <link:label id="lab_ptv_ReconciliationOfEffectiveTaxRateTable_40f334f7-3958-40de-a25b-e89fdb239f84_terseLabel_en-US" xlink:label="lab_ptv_ReconciliationOfEffectiveTaxRateTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of Effective Tax Rate [Table]</link:label>
    <link:label id="lab_ptv_ReconciliationOfEffectiveTaxRateTable_label_en-US" xlink:label="lab_ptv_ReconciliationOfEffectiveTaxRateTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of Effective Tax Rate [Table]</link:label>
    <link:label id="lab_ptv_ReconciliationOfEffectiveTaxRateTable_documentation_en-US" xlink:label="lab_ptv_ReconciliationOfEffectiveTaxRateTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of Effective Tax Rate [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ReconciliationOfEffectiveTaxRateTable" xlink:href="ptv-20211231.xsd#ptv_ReconciliationOfEffectiveTaxRateTable"/>
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    <link:label id="lab_ptv_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleDecreaseInRiskVariablePeriod_6c4a14e4-99f5-4e77-8087-dbff4d6fa14f_terseLabel_en-US" xlink:label="lab_ptv_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleDecreaseInRiskVariablePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Range</link:label>
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    <link:label id="lab_ptv_ContractualInterestExpenseOnNotes_3b913211-6694-4773-bf02-af3647b3c88c_negatedTerseLabel_en-US" xlink:label="lab_ptv_ContractualInterestExpenseOnNotes" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual interest expense on notes payable</link:label>
    <link:label id="lab_ptv_ContractualInterestExpenseOnNotes_label_en-US" xlink:label="lab_ptv_ContractualInterestExpenseOnNotes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Interest expense on notes</link:label>
    <link:label id="lab_ptv_ContractualInterestExpenseOnNotes_documentation_en-US" xlink:label="lab_ptv_ContractualInterestExpenseOnNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Interest expense on notes</link:label>
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    <link:label id="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired_1728f49a-579c-4f84-9d31-8a2c09e88c39_terseLabel_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in subsidiary, additional ownership acquired</link:label>
    <link:label id="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired_label_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in subsidiary, additional ownership acquired</link:label>
    <link:label id="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired_documentation_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in subsidiary, additional ownership acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:href="ptv-20211231.xsd#ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:to="lab_ptv_ProportionOfOwnershipInterestInSubsidiaryAdditionalOwnershipAcquired" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConvertibleNotesMember_22f0999c-241a-49bb-97d9-aea61f4454e3_terseLabel_en-US" xlink:label="lab_ptv_ConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes [Member]</link:label>
    <link:label id="lab_ptv_ConvertibleNotesMember_label_en-US" xlink:label="lab_ptv_ConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes [Member]</link:label>
    <link:label id="lab_ptv_ConvertibleNotesMember_documentation_en-US" xlink:label="lab_ptv_ConvertibleNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConvertibleNotesMember" xlink:href="ptv-20211231.xsd#ptv_ConvertibleNotesMember"/>
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    <link:label id="lab_ptv_LiquidityRiskAbstract_42960830-1332-455b-88c9-cdf1be9afa8f_terseLabel_en-US" xlink:label="lab_ptv_LiquidityRiskAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Credit Risk Abstract [Abstract]</link:label>
    <link:label id="lab_ptv_LiquidityRiskAbstract_label_en-US" xlink:label="lab_ptv_LiquidityRiskAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liquidity Risk [Abstract]</link:label>
    <link:label id="lab_ptv_LiquidityRiskAbstract_documentation_en-US" xlink:label="lab_ptv_LiquidityRiskAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liquidity Risk</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LiquidityRiskAbstract" xlink:href="ptv-20211231.xsd#ptv_LiquidityRiskAbstract"/>
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    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_8a1df37e-3ee1-46dc-b563-dcfc81fd196d_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other payables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_d2a360e2-9e3c-4787-b4f9-33d51aa84b00_totalLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total trade and other payables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConvertibleInstrumentsInterestRate_2da72c97-7f30-4c52-a4d4-19429dd0503e_terseLabel_en-US" xlink:label="lab_ptv_ConvertibleInstrumentsInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible instruments, interest rate</link:label>
    <link:label id="lab_ptv_ConvertibleInstrumentsInterestRate_label_en-US" xlink:label="lab_ptv_ConvertibleInstrumentsInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible instruments, interest rate</link:label>
    <link:label id="lab_ptv_ConvertibleInstrumentsInterestRate_documentation_en-US" xlink:label="lab_ptv_ConvertibleInstrumentsInterestRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible instruments, interest rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConvertibleInstrumentsInterestRate" xlink:href="ptv-20211231.xsd#ptv_ConvertibleInstrumentsInterestRate"/>
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    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_ce0bdeed-bc49-41f9-81b1-85170b1b3556_verboseLabel_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cost</link:label>
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    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross carrying amount [member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainOnDeconsolidationAbstract" xlink:href="ptv-20211231.xsd#ptv_GainOnDeconsolidationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GainOnDeconsolidationAbstract" xlink:to="lab_ptv_GainOnDeconsolidationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_c73534dc-4bb7-4d1a-98e8-6d5f9b4318f4_totalLabel_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total equity and liabilities</link:label>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_label_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Revenue_b59c431a-6a3e-4566-91f6-5507bddd3637_totalLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_85fee6f9-7351-44be-a2a1-36fe920b401b_terseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_872552f1-de4d-4515-ad74-293568544650_verboseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_label_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_Revenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Revenue" xlink:to="lab_ifrs-full_Revenue" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedAbstract_8891becf-c2a0-4c9a-a9d6-7c7701b7e552_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedAbstract_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsForfeitedAbstract_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options forfeited</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsForfeitedAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:to="lab_ptv_WeightedAverageOptionsForfeitedAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProfitLossBeforeTaxPreIAS39_5d91fac4-45f2-42ab-b2d6-1c515048c65e_terseLabel_en-US" xlink:label="lab_ptv_ProfitLossBeforeTaxPreIAS39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">(Loss)/income before taxes pre IAS 39 fair value accounting, finance costs &#8211; subsidiary preferred shares, share-based payment expense, depreciation of tangible assets and amortization of intangible assets</link:label>
    <link:label id="lab_ptv_ProfitLossBeforeTaxPreIAS39_label_en-US" xlink:label="lab_ptv_ProfitLossBeforeTaxPreIAS39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit Loss Before Tax pre IAS 39</link:label>
    <link:label id="lab_ptv_ProfitLossBeforeTaxPreIAS39_documentation_en-US" xlink:label="lab_ptv_ProfitLossBeforeTaxPreIAS39" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit Loss Before Tax pre IAS 39</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProfitLossBeforeTaxPreIAS39" xlink:href="ptv-20211231.xsd#ptv_ProfitLossBeforeTaxPreIAS39"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProfitLossBeforeTaxPreIAS39" xlink:to="lab_ptv_ProfitLossBeforeTaxPreIAS39" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProfitLossAttributableToOrdinaryShareholders_74465843-b76d-43b4-8565-c02bbc15e035_terseLabel_en-US" xlink:label="lab_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income/(loss) attributable to ordinary shareholders</link:label>
    <link:label id="lab_ptv_ProfitLossAttributableToOrdinaryShareholders_label_en-US" xlink:label="lab_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit Loss Attributable To Ordinary Shareholders</link:label>
    <link:label id="lab_ptv_ProfitLossAttributableToOrdinaryShareholders_documentation_en-US" xlink:label="lab_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit Loss Attributable To Ordinary Shareholders</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:href="ptv-20211231.xsd#ptv_ProfitLossAttributableToOrdinaryShareholders"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:to="lab_ptv_ProfitLossAttributableToOrdinaryShareholders" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock_492c7ba8-1a53-4357-9214-6684bfaa66bd_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses</link:label>
    <link:label id="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Operating Expense Explanatory [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Operating Expense Explanatory</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:to="lab_ptv_DisclosureOfOperatingExpenseExplanatoryTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ExercisePriceRangeThreeMember_93a805c1-814c-4082-8c2e-e0dda0ed6d01_terseLabel_en-US" xlink:label="lab_ptv_ExercisePriceRangeThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2.00 to 3.00</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeThreeMember_label_en-US" xlink:label="lab_ptv_ExercisePriceRangeThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Three [Member]</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeThreeMember_documentation_en-US" xlink:label="lab_ptv_ExercisePriceRangeThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Three [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExercisePriceRangeThreeMember" xlink:href="ptv-20211231.xsd#ptv_ExercisePriceRangeThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ExercisePriceRangeThreeMember" xlink:to="lab_ptv_ExercisePriceRangeThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AccountingPoliciesLineItems_d38b4a0f-9356-4de7-bfbd-a57fe295169f_terseLabel_en-US" xlink:label="lab_ptv_AccountingPoliciesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies</link:label>
    <link:label id="lab_ptv_AccountingPoliciesLineItems_label_en-US" xlink:label="lab_ptv_AccountingPoliciesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies [Line Items]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesLineItems_documentation_en-US" xlink:label="lab_ptv_AccountingPoliciesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AccountingPoliciesLineItems" xlink:href="ptv-20211231.xsd#ptv_AccountingPoliciesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AccountingPoliciesLineItems" xlink:to="lab_ptv_AccountingPoliciesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LeasesAbstract_42dcdba1-833d-4abf-8dcb-8ec0779d8d19_terseLabel_en-US" xlink:label="lab_ptv_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:label id="lab_ptv_LeasesAbstract_label_en-US" xlink:label="lab_ptv_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:label id="lab_ptv_LeasesAbstract_documentation_en-US" xlink:label="lab_ptv_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LeasesAbstract" xlink:href="ptv-20211231.xsd#ptv_LeasesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LeasesAbstract" xlink:to="lab_ptv_LeasesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinanceLeasePaymentsReceivableLineItems_08b60284-b2f7-4014-a94b-c002c8964f7e_terseLabel_en-US" xlink:label="lab_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance lease payments receivable [Line Items]</link:label>
    <link:label id="lab_ptv_FinanceLeasePaymentsReceivableLineItems_label_en-US" xlink:label="lab_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance lease payments receivable [Line Items]</link:label>
    <link:label id="lab_ptv_FinanceLeasePaymentsReceivableLineItems_documentation_en-US" xlink:label="lab_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance lease payments receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:href="ptv-20211231.xsd#ptv_FinanceLeasePaymentsReceivableLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:to="lab_ptv_FinanceLeasePaymentsReceivableLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PureTechAndThirdPartyMember_8b224e20-9de8-434e-bcc4-cb5d5531b8a5_terseLabel_en-US" xlink:label="lab_ptv_PureTechAndThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech and third-party</link:label>
    <link:label id="lab_ptv_PureTechAndThirdPartyMember_label_en-US" xlink:label="lab_ptv_PureTechAndThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech and third-party [Member]</link:label>
    <link:label id="lab_ptv_PureTechAndThirdPartyMember_documentation_en-US" xlink:label="lab_ptv_PureTechAndThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech and third-party</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PureTechAndThirdPartyMember" xlink:href="ptv-20211231.xsd#ptv_PureTechAndThirdPartyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PureTechAndThirdPartyMember" xlink:to="lab_ptv_PureTechAndThirdPartyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCurrentReportingStatus_d3b7f772-840d-4653-858c-8002c6986396_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:label id="lab_dei_EntityCurrentReportingStatus_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCurrentReportingStatus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus" xlink:to="lab_dei_EntityCurrentReportingStatus" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock_a67748dc-a949-49a5-b737-8420dd8d916b_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease liability</link:label>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease liability [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of short-term and long-term portion of lease liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:to="lab_ptv_DisclosureOfShortTermAndLongTermPortionOfLeaseLiabilityTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonControllingInterestsLineItems_39a05618-c287-4225-86e3-52142c643da1_terseLabel_en-US" xlink:label="lab_ptv_NonControllingInterestsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Line Items]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsLineItems_label_en-US" xlink:label="lab_ptv_NonControllingInterestsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests [Line Items]</link:label>
    <link:label id="lab_ptv_NonControllingInterestsLineItems_documentation_en-US" xlink:label="lab_ptv_NonControllingInterestsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Controlling Interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonControllingInterestsLineItems" xlink:href="ptv-20211231.xsd#ptv_NonControllingInterestsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonControllingInterestsLineItems" xlink:to="lab_ptv_NonControllingInterestsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ScheduleOfContractBalancesTextBlock_2194e134-d058-4bda-8b95-932714f34651_terseLabel_en-US" xlink:label="lab_ptv_ScheduleOfContractBalancesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contract Balances</link:label>
    <link:label id="lab_ptv_ScheduleOfContractBalancesTextBlock_label_en-US" xlink:label="lab_ptv_ScheduleOfContractBalancesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contract Balances [Text Block]</link:label>
    <link:label id="lab_ptv_ScheduleOfContractBalancesTextBlock_documentation_en-US" xlink:label="lab_ptv_ScheduleOfContractBalancesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contract Balances</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ScheduleOfContractBalancesTextBlock" xlink:href="ptv-20211231.xsd#ptv_ScheduleOfContractBalancesTextBlock"/>
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    <link:label id="lab_ptv_MinimumLiquidationPreferenceTable_c7b6d70b-0bb8-47aa-ad0b-a8c7b5c7b85e_terseLabel_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Table]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceTable_label_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Table]</link:label>
    <link:label id="lab_ptv_MinimumLiquidationPreferenceTable_documentation_en-US" xlink:label="lab_ptv_MinimumLiquidationPreferenceTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum liquidation preference [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MinimumLiquidationPreferenceTable" xlink:href="ptv-20211231.xsd#ptv_MinimumLiquidationPreferenceTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_MinimumLiquidationPreferenceTable" xlink:to="lab_ptv_MinimumLiquidationPreferenceTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability_0b6299a5-2077-4d31-a624-ac6ae2199975_terseLabel_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of warrant liability</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability_label_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of warrant liability</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability_documentation_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfWarrantLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of warrant liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainLossFromChangeInFairValueOfWarrantLiability" xlink:href="ptv-20211231.xsd#ptv_GainLossFromChangeInFairValueOfWarrantLiability"/>
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    <link:label id="lab_ptv_AdjustmentsRightOfUseAssets_72a43859-91c1-4e46-a651-190506fe7e4a_terseLabel_en-US" xlink:label="lab_ptv_AdjustmentsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments</link:label>
    <link:label id="lab_ptv_AdjustmentsRightOfUseAssets_label_en-US" xlink:label="lab_ptv_AdjustmentsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments, right-of-use assets</link:label>
    <link:label id="lab_ptv_AdjustmentsRightOfUseAssets_documentation_en-US" xlink:label="lab_ptv_AdjustmentsRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments, right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AdjustmentsRightOfUseAssets" xlink:href="ptv-20211231.xsd#ptv_AdjustmentsRightOfUseAssets"/>
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    <link:label id="lab_ifrs-full_AccrualsClassifiedAsCurrent_99edf8dd-0755-45ba-a479-48a742dbbef1_terseLabel_en-US" xlink:label="lab_ifrs-full_AccrualsClassifiedAsCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued expenses</link:label>
    <link:label id="lab_ifrs-full_AccrualsClassifiedAsCurrent_label_en-US" xlink:label="lab_ifrs-full_AccrualsClassifiedAsCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accruals classified as current</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccrualsClassifiedAsCurrent" xlink:to="lab_ifrs-full_AccrualsClassifiedAsCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentAccountingStandard_36e882f2-39be-4b6d-bab7-cfbd4f7974e0_terseLabel_en-US" xlink:label="lab_dei_DocumentAccountingStandard" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Accounting Standard</link:label>
    <link:label id="lab_dei_DocumentAccountingStandard_label_en-US" xlink:label="lab_dei_DocumentAccountingStandard" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Accounting Standard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAccountingStandard" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentAccountingStandard"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAccountingStandard" xlink:to="lab_dei_DocumentAccountingStandard" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CreditExposure_f4a56309-879b-40b0-b01a-2900745f668c_totalLabel_en-US" xlink:label="lab_ifrs-full_CreditExposure" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_CreditExposure_label_en-US" xlink:label="lab_ifrs-full_CreditExposure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Credit exposure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditExposure" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CreditExposure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CreditExposure" xlink:to="lab_ifrs-full_CreditExposure" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TopOfRangeMember_714325ef-cdbf-4eaa-98fa-7b0d8b9a1c79_terseLabel_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Top of range [member]</link:label>
    <link:label id="lab_ifrs-full_TopOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Top of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TopOfRangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TopOfRangeMember" xlink:to="lab_ifrs-full_TopOfRangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PureTechManagementMember_627aee2a-7059-4ffa-bde0-584ac7e9fc80_verboseLabel_en-US" xlink:label="lab_ptv_PureTechManagementMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Management, Inc.</link:label>
    <link:label id="lab_ptv_PureTechManagementMember_label_en-US" xlink:label="lab_ptv_PureTechManagementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Management [Member]</link:label>
    <link:label id="lab_ptv_PureTechManagementMember_documentation_en-US" xlink:label="lab_ptv_PureTechManagementMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Management</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PureTechManagementMember" xlink:href="ptv-20211231.xsd#ptv_PureTechManagementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PureTechManagementMember" xlink:to="lab_ptv_PureTechManagementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_0ce0b798-0918-4bbc-a9bd-87b748b189a8_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net cash provided by investing activities</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
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    <link:label id="lab_ptv_A2017PerformanceBasedRSUMember_03afcb26-323b-40ab-b3aa-b8484afe1c65_terseLabel_en-US" xlink:label="lab_ptv_A2017PerformanceBasedRSUMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2017 Performance Based RSU [Member]</link:label>
    <link:label id="lab_ptv_A2017PerformanceBasedRSUMember_label_en-US" xlink:label="lab_ptv_A2017PerformanceBasedRSUMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2017 Performance Based RSU [Member]</link:label>
    <link:label id="lab_ptv_A2017PerformanceBasedRSUMember_documentation_en-US" xlink:label="lab_ptv_A2017PerformanceBasedRSUMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2017 Performance Based RSU</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_A2017PerformanceBasedRSUMember" xlink:href="ptv-20211231.xsd#ptv_A2017PerformanceBasedRSUMember"/>
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    <link:label id="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_e06c2f0b-6f37-4607-8ca2-3de0c26e3ffa_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Standards and Interpretations Not Yet Adopted</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of expected impact of initial application of new standards or interpretations [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:to="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageMember_a1ef8272-4d95-4524-ad89-450f2fefa29e_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average [member]</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageMember_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_WeightedAverageMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageMember" xlink:to="lab_ifrs-full_WeightedAverageMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_CounterpartyNameAxis_48a27f37-067c-4044-a79e-457be58ebdd1_terseLabel_en-US" xlink:label="lab_srt_CounterpartyNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparty Name [Axis]</link:label>
    <link:label id="lab_srt_CounterpartyNameAxis_label_en-US" xlink:label="lab_srt_CounterpartyNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparty Name [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_CounterpartyNameAxis" xlink:to="lab_srt_CounterpartyNameAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TaxationTable_e4cea5e5-6ad7-4fe8-b92f-bb3ebada1c4a_terseLabel_en-US" xlink:label="lab_ptv_TaxationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation [Table]</link:label>
    <link:label id="lab_ptv_TaxationTable_label_en-US" xlink:label="lab_ptv_TaxationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation [Table]</link:label>
    <link:label id="lab_ptv_TaxationTable_documentation_en-US" xlink:label="lab_ptv_TaxationTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TaxationTable" xlink:href="ptv-20211231.xsd#ptv_TaxationTable"/>
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    <link:label id="lab_country_US_ad86a068-ac4b-4f62-a778-f9b699d89bfb_terseLabel_en-US" xlink:label="lab_country_US" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">UNITED STATES</link:label>
    <link:label id="lab_country_US_label_en-US" xlink:label="lab_country_US" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">UNITED STATES</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_US" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US" xlink:to="lab_country_US" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AuditOfFinancialStatementsOfSubsidiaries_87e6d56d-d93e-4750-a8f6-5f979f401cc9_terseLabel_en-US" xlink:label="lab_ptv_AuditOfFinancialStatementsOfSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of the financial statements of subsidiaries</link:label>
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    <link:label id="lab_ptv_AuditOfFinancialStatementsOfSubsidiaries_documentation_en-US" xlink:label="lab_ptv_AuditOfFinancialStatementsOfSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of financial statements of subsidiaries</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AuditOfFinancialStatementsOfSubsidiaries" xlink:href="ptv-20211231.xsd#ptv_AuditOfFinancialStatementsOfSubsidiaries"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AuditOfFinancialStatementsOfSubsidiaries" xlink:to="lab_ptv_AuditOfFinancialStatementsOfSubsidiaries" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_bb0dc075-8a5d-43fc-9708-893a8572380e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of finance income (cost) [text block]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of finance income (cost) [text block]</link:label>
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    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyAbstract_908f07fd-dbe0-4531-ae5d-f68217382179_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsAbstract_44ec4a5b-124d-4d66-b9f8-7512a951c4bf_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of assets [abstract]</link:label>
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    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsForfeitedInShareBasedPaymentArrangement_4e837a37-d616-492b-bce3-de3c41df2fe4_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsForfeitedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value, RSU forfeited (in GBP per share)</link:label>
    <link:label id="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsForfeitedInShareBasedPaymentArrangement_label_en-US" xlink:label="lab_ptv_WeightedAverageGrantDateFairValueOfOtherEquityInstrumentsForfeitedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average grant date fair value of other equity instruments forfeited in share-based payment arrangement</link:label>
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    <link:label id="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_9cc283c1-6380-43bb-a14a-a4804982a60e_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of share options granted in share-based payment arrangement</link:label>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_e8e766fd-f272-4731-8d09-d0f312c97846_verboseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Granted (in shares)</link:label>
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    <link:label id="lab_ptv_MandaraSciencesLLCMember_a2e5043f-d97f-4509-ae8f-8c09cdf56dfd_verboseLabel_en-US" xlink:label="lab_ptv_MandaraSciencesLLCMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mandara Sciences, LLC</link:label>
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    <link:label id="lab_ifrs-full_Liabilities_255ba4fb-9d58-41ee-87c2-4f64e335e38d_totalLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total liabilities</link:label>
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    <link:label id="lab_ifrs-full_Liabilities_label_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liabilities</link:label>
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    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_ec0f7679-d748-40b5-9aa3-76e91412766d_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2023</link:label>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_7d3c8669-7613-4e46-b0cd-3db5077a281e_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">One to two years</link:label>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than one year and not later than two years [member]</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_83d407bf-52c4-4a8d-b80c-679a0fbff7bb_totalLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net increase in cash and cash equivalents</link:label>
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    <link:label id="lab_ptv_ShareBasedPaymentArrangementsAuthorizedAmountPercentageOfCommonSharesOutstanding_b14baa4b-702c-4955-a9be-7c5ef2b414ce_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentArrangementsAuthorizedAmountPercentageOfCommonSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Arrangements, Authorized Amount, Percentage of Common Shares Outstanding</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentArrangementsAuthorizedAmountPercentageOfCommonSharesOutstanding_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentArrangementsAuthorizedAmountPercentageOfCommonSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Arrangements, Authorized Amount, Percentage of Common Shares Outstanding</link:label>
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    <link:label id="lab_ifrs-full_ProportionOfVotingPowerHeldInAssociate_81d7c706-4292-4564-a5c3-61de9ca35b41_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfVotingPowerHeldInAssociate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of voting rights held in associate</link:label>
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    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares_abc24248-da8f-4884-aa65-c72cd2576c02_terseLabel_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of preferred shares</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares_label_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of preferred shares</link:label>
    <link:label id="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares_documentation_en-US" xlink:label="lab_ptv_GainLossFromChangeInFairValueOfPreferredShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) from change in fair value of preferred shares</link:label>
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    <link:label id="lab_ptv_OperatingExpenseCategoryAxis_4dd786b3-d8f3-4116-87f8-6e6ada1a29fe_terseLabel_en-US" xlink:label="lab_ptv_OperatingExpenseCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense Category [Axis]</link:label>
    <link:label id="lab_ptv_OperatingExpenseCategoryAxis_label_en-US" xlink:label="lab_ptv_OperatingExpenseCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense Category [Axis]</link:label>
    <link:label id="lab_ptv_OperatingExpenseCategoryAxis_documentation_en-US" xlink:label="lab_ptv_OperatingExpenseCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expense Category</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OperatingExpenseCategoryAxis" xlink:href="ptv-20211231.xsd#ptv_OperatingExpenseCategoryAxis"/>
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    <link:label id="lab_ptv_ChangeInFairValue_67d3e48c-412f-4b6d-945b-4d5be7800d18_verboseLabel_en-US" xlink:label="lab_ptv_ChangeInFairValue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase in value of preferred shares measured at fair value</link:label>
    <link:label id="lab_ptv_ChangeInFairValue_eab66112-8b2e-4a58-82bb-96292e260013_terseLabel_en-US" xlink:label="lab_ptv_ChangeInFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in fair value</link:label>
    <link:label id="lab_ptv_ChangeInFairValue_label_en-US" xlink:label="lab_ptv_ChangeInFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in fair value</link:label>
    <link:label id="lab_ptv_ChangeInFairValue_documentation_en-US" xlink:label="lab_ptv_ChangeInFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ChangeInFairValue" xlink:href="ptv-20211231.xsd#ptv_ChangeInFairValue"/>
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    <link:label id="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_ddffd536-cf49-4012-8c4a-3f41cd767d54_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of income tax [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory"/>
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    <link:label id="lab_ptv_AccountingPoliciesTable_c192bf85-9622-435f-a400-a20717925495_terseLabel_en-US" xlink:label="lab_ptv_AccountingPoliciesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies [Table]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesTable_label_en-US" xlink:label="lab_ptv_AccountingPoliciesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies [Table]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesTable_documentation_en-US" xlink:label="lab_ptv_AccountingPoliciesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AccountingPoliciesTable" xlink:href="ptv-20211231.xsd#ptv_AccountingPoliciesTable"/>
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    <link:label id="lab_dei_EntityAddressAddressLine1_debc51f5-d072-4dc3-9304-baeb1894e067_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine1"/>
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    <link:label id="lab_dei_EntityAddressAddressLine2_fa2a1a36-2b4b-4747-9310-b3f3a6f201c6_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line Two</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine2_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine2"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine2" xlink:to="lab_dei_EntityAddressAddressLine2" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherGainsLosses_23627b75-7f48-4118-948e-0fe9d9205a0d_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherGainsLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other income/(expense)</link:label>
    <link:label id="lab_ifrs-full_OtherGainsLosses_10277468-3b4b-4814-8747-72b1e9d22be4_totalLabel_en-US" xlink:label="lab_ifrs-full_OtherGainsLosses" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other income/(expense)</link:label>
    <link:label id="lab_ifrs-full_OtherGainsLosses_label_en-US" xlink:label="lab_ifrs-full_OtherGainsLosses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other gains (losses)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherGainsLosses" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherGainsLosses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherGainsLosses" xlink:to="lab_ifrs-full_OtherGainsLosses" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IntangibleAssetsAbstract_7ae7a1c4-541d-46e6-bb48-136beff2afd3_terseLabel_en-US" xlink:label="lab_ptv_IntangibleAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets [Abstract]</link:label>
    <link:label id="lab_ptv_IntangibleAssetsAbstract_label_en-US" xlink:label="lab_ptv_IntangibleAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets [Abstract]</link:label>
    <link:label id="lab_ptv_IntangibleAssetsAbstract_documentation_en-US" xlink:label="lab_ptv_IntangibleAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IntangibleAssetsAbstract" xlink:href="ptv-20211231.xsd#ptv_IntangibleAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IntangibleAssetsAbstract" xlink:to="lab_ptv_IntangibleAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract_f3dd4728-799d-45de-959f-95d47c957518_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:to="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityShellCompany_bcfdfe81-8ad3-4a05-9885-a82bd55e9f83_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Shell Company</link:label>
    <link:label id="lab_dei_EntityShellCompany_label_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Shell Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityShellCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityShellCompany" xlink:to="lab_dei_EntityShellCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory_08be9bae-3d73-4db6-9c53-6eacebfb3b8f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory"/>
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    <link:label id="lab_ptv_ShortTermNoteAbstract_f94ba256-8fca-4307-bea9-063f83ff36d7_terseLabel_en-US" xlink:label="lab_ptv_ShortTermNoteAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Abstract]</link:label>
    <link:label id="lab_ptv_ShortTermNoteAbstract_label_en-US" xlink:label="lab_ptv_ShortTermNoteAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Abstract]</link:label>
    <link:label id="lab_ptv_ShortTermNoteAbstract_documentation_en-US" xlink:label="lab_ptv_ShortTermNoteAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShortTermNoteAbstract" xlink:href="ptv-20211231.xsd#ptv_ShortTermNoteAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShortTermNoteAbstract" xlink:to="lab_ptv_ShortTermNoteAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsExercisedAbstract_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsExercisedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options exercised [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsExercisedAbstract_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsExercisedAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options exercised</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsExercisedAbstract" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsExercisedAbstract"/>
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    <link:label id="lab_ifrs-full_RevenueFromGovernmentGrants_0026650e-a71b-45a5-bcaa-676a047d2e57_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueFromGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Grant revenue</link:label>
    <link:label id="lab_ifrs-full_RevenueFromGovernmentGrants_label_en-US" xlink:label="lab_ifrs-full_RevenueFromGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income from government grants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromGovernmentGrants" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RevenueFromGovernmentGrants"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_2389e80e-173b-4c31-8b15-674ad8bddea4_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deconsolidation of subsidiary</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through disposal of subsidiary, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_d7662e76-fe2f-41fd-a817-825502928ee3_verboseLabel_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets, net, recognized</link:label>
    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_label_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net deferred tax assets</link:label>
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    <link:label id="lab_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_176b2b3f-0cbf-467a-bd5f-2bba67220512_verboseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forfeited (in shares)</link:label>
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    <link:label id="lab_ptv_SubsidiaryTypesDomain_382c1eef-ec23-4742-80b7-2215fcc0c28f_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryTypesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Types [Domain]</link:label>
    <link:label id="lab_ptv_SubsidiaryTypesDomain_label_en-US" xlink:label="lab_ptv_SubsidiaryTypesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Types [Domain]</link:label>
    <link:label id="lab_ptv_SubsidiaryTypesDomain_documentation_en-US" xlink:label="lab_ptv_SubsidiaryTypesDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Types [Domain]</link:label>
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    <link:label id="lab_ifrs-full_IncomeStatementAbstract_label_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeStatementAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncomeStatementAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeStatementAbstract" xlink:to="lab_ifrs-full_IncomeStatementAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember_884864a4-4629-4b1a-ad88-362c85b0ee3a_terseLabel_en-US" xlink:label="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input, Probability Of Occurrence</link:label>
    <link:label id="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember_label_en-US" xlink:label="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input, Probability Of Occurrence [Member]</link:label>
    <link:label id="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember_documentation_en-US" xlink:label="lab_ptv_MeasurementInputProbabilityOfOccurrenceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input, Probability Of Occurrence</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MeasurementInputProbabilityOfOccurrenceMember" xlink:href="ptv-20211231.xsd#ptv_MeasurementInputProbabilityOfOccurrenceMember"/>
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    <link:label id="lab_ifrs-full_BottomOfRangeMember_e26ed00c-b50a-4bdc-ab79-2e307f82bcde_terseLabel_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Bottom of range [member]</link:label>
    <link:label id="lab_ifrs-full_BottomOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Bottom of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_BottomOfRangeMember"/>
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    <link:label id="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares_a38534a5-d991-4835-bd1f-98db311573de_terseLabel_en-US" xlink:label="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of dilutive shares</link:label>
    <link:label id="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares_label_en-US" xlink:label="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dilutive effect of share options on number of ordinary shares</link:label>
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    <link:label id="lab_ifrs-full_TypesOfCustomersAxis_68c4739b-f642-4e91-9c9f-bd797eec37a9_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfCustomersAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of customers [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfCustomersAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfCustomersAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of customers [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfCustomersAxis" xlink:to="lab_ifrs-full_TypesOfCustomersAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock_38cb71ae-2508-4ff1-994a-77afd7eaaeff_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Long-term loan obligations</link:label>
    <link:label id="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of long-term loan obligations [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of long-term loan obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfLongTermLoanObligationsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:to="lab_ptv_DisclosureOfLongTermLoanObligationsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentFinancialLiabilities_b4fbf116-2d12-4b3e-8063-08dcf321fe68_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current financial liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentFinancialLiabilities_6c8e07ac-0888-4602-98ec-c4834414f12a_periodStartLabel_en-US" xlink:label="lab_ifrs-full_CurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_ifrs-full_CurrentFinancialLiabilities_2b2ac99d-692a-4581-a9e7-ac722c349f9f_periodEndLabel_en-US" xlink:label="lab_ifrs-full_CurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance</link:label>
    <link:label id="lab_ifrs-full_CurrentFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentFinancialLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentFinancialLiabilities" xlink:to="lab_ifrs-full_CurrentFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue_c872839c-a3bc-4cdc-a4da-b49bbcaf01b3_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, additional shares to be received at no additional cost, fair value</link:label>
    <link:label id="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue_label_en-US" xlink:label="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Additional Shares To Be Received At No Additional Cost, Fair Value</link:label>
    <link:label id="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue_documentation_en-US" xlink:label="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Additional Shares To Be Received At No Additional Cost, Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:href="ptv-20211231.xsd#ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:to="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeAxis_93f2debf-a44b-4836-8919-6a12c86d6cc0_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_label_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis" xlink:to="lab_srt_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment_78f84337-1659-4f70-99aa-5d0656493da3_terseLabel_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, first installment</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment_label_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, first installment</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment_documentation_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, first installment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment" xlink:href="ptv-20211231.xsd#ptv_ConsiderationForAcquiredNonControllingInterestFirstInstallment"/>
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    <link:label id="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock_4bf6c3e4-2910-43c8-b57c-d2f3865ab73e_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of unrecognized tax losses and tax credits carryforwards</link:label>
    <link:label id="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of unrecognized tax losses and tax credits, deferred tax assets [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfUnrecognizedTaxLossesAndTaxCreditsDeferredTaxAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of unrecognized tax losses and tax credits, deferred tax assets</link:label>
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    <link:label id="lab_ptv_DisclosureOfChangesInAssetsLevel3FairValueInvestmentsHeldAtFairValueTextBlock_706dd184-4526-49d5-b264-fe736147e31b_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfChangesInAssetsLevel3FairValueInvestmentsHeldAtFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of changes in assets, level 3 fair value - investments held at fair value [Text Block]</link:label>
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    <link:label id="lab_ptv_DisclosureOfChangesInAssetsLevel3FairValueInvestmentsHeldAtFairValueTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfChangesInAssetsLevel3FairValueInvestmentsHeldAtFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of changes in assets, level 3 fair value - investments held at fair value</link:label>
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    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_06d570ff-1452-4aeb-a12b-30caf6c69a9c_terseLabel_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions</link:label>
    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions other than through business combinations, intangible assets other than goodwill</link:label>
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    <link:label id="lab_ptv_InvestmentsHeldAtFairValueLineItems_abe94f54-3462-4fcb-9fa4-cac640776a12_terseLabel_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value [Line Items]</link:label>
    <link:label id="lab_ptv_InvestmentsHeldAtFairValueLineItems_label_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value [Line Items]</link:label>
    <link:label id="lab_ptv_InvestmentsHeldAtFairValueLineItems_documentation_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_InvestmentsHeldAtFairValueLineItems" xlink:href="ptv-20211231.xsd#ptv_InvestmentsHeldAtFairValueLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_InvestmentsHeldAtFairValueLineItems" xlink:to="lab_ptv_InvestmentsHeldAtFairValueLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember_0047e36e-22eb-4d58-ab35-6e089c05a05a_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance obligations satisfied over time [member]</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance obligations satisfied over time [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PerformanceObligationsSatisfiedOverTimeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:to="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesMember_0ea92711-8a02-4eef-9f1f-f67f516dec2e_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial liabilities, class [member]</link:label>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesMember_label_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial liabilities, class [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_FinancialLiabilitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialLiabilitiesMember" xlink:to="lab_ifrs-full_FinancialLiabilitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_InvestmentsHeldAtFairValueMember_dadbb7aa-964c-4633-b42d-1790593dc0b5_terseLabel_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value</link:label>
    <link:label id="lab_ptv_InvestmentsHeldAtFairValueMember_label_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value [Member]</link:label>
    <link:label id="lab_ptv_InvestmentsHeldAtFairValueMember_documentation_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_InvestmentsHeldAtFairValueMember" xlink:href="ptv-20211231.xsd#ptv_InvestmentsHeldAtFairValueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_InvestmentsHeldAtFairValueMember" xlink:to="lab_ptv_InvestmentsHeldAtFairValueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_bb1944bb-bbb7-4f61-9f66-3bb3c86d9e64_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liability</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_76e37433-c9e4-4fb6-9f4d-7d41e6bb356e_verboseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liabilities</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxLiabilities" xlink:to="lab_ifrs-full_DeferredTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EarningsLossPerShareTable_ced47611-4807-4cbc-8de2-0f83c28072ad_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossPerShareTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Loss per Share [Table]</link:label>
    <link:label id="lab_ptv_EarningsLossPerShareTable_label_en-US" xlink:label="lab_ptv_EarningsLossPerShareTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Loss per Share [Table]</link:label>
    <link:label id="lab_ptv_EarningsLossPerShareTable_documentation_en-US" xlink:label="lab_ptv_EarningsLossPerShareTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Loss per Share [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EarningsLossPerShareTable" xlink:href="ptv-20211231.xsd#ptv_EarningsLossPerShareTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EarningsLossPerShareTable" xlink:to="lab_ptv_EarningsLossPerShareTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount_b6ecb56f-4ebc-4012-a0b1-c42720ac406e_terseLabel_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, final fee trigger amount</link:label>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount_label_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, final fee trigger amount</link:label>
    <link:label id="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount_documentation_en-US" xlink:label="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, final fee trigger amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:href="ptv-20211231.xsd#ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:to="lab_ptv_DebtInstrumentPaymentTermsFinalFeeTriggerAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory_ad743283-f906-44f5-9870-9d64482065dd_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share-based payment arrangements [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary_a0eeba3b-51eb-4d18-99c5-2d9cffaa3c96_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Voting percentage through the holdings</link:label>
    <link:label id="lab_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary_label_en-US" xlink:label="lab_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of voting rights held in subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProportionOfVotingPowerHeldInSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary" xlink:to="lab_ifrs-full_ProportionOfVotingPowerHeldInSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AcquisitionCost_7c7cf06a-4536-45be-90b4-c9f2c1f1321d_terseLabel_en-US" xlink:label="lab_ptv_AcquisitionCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition cost</link:label>
    <link:label id="lab_ptv_AcquisitionCost_label_en-US" xlink:label="lab_ptv_AcquisitionCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition cost</link:label>
    <link:label id="lab_ptv_AcquisitionCost_documentation_en-US" xlink:label="lab_ptv_AcquisitionCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AcquisitionCost" xlink:href="ptv-20211231.xsd#ptv_AcquisitionCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AcquisitionCost" xlink:to="lab_ptv_AcquisitionCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax_f01f4859-c9fd-4b91-bfba-5e9eae0acfa5_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign currency translation differences</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) on exchange differences on translation of foreign operations, before tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:to="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PercentVotingRightsOfTheCompany_c686564f-463d-4870-85fc-618373074b2c_terseLabel_en-US" xlink:label="lab_ptv_PercentVotingRightsOfTheCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent voting rights of the Companny</link:label>
    <link:label id="lab_ptv_PercentVotingRightsOfTheCompany_label_en-US" xlink:label="lab_ptv_PercentVotingRightsOfTheCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent voting rights of the Company</link:label>
    <link:label id="lab_ptv_PercentVotingRightsOfTheCompany_documentation_en-US" xlink:label="lab_ptv_PercentVotingRightsOfTheCompany" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percent voting rights of the Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PercentVotingRightsOfTheCompany" xlink:href="ptv-20211231.xsd#ptv_PercentVotingRightsOfTheCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PercentVotingRightsOfTheCompany" xlink:to="lab_ptv_PercentVotingRightsOfTheCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesLineItems_9ebf04a2-3fed-42ac-8cce-e0587802427c_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Line Items]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesLineItems_label_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares [Line Items]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesLineItems_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryPreferredSharesLineItems" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryPreferredSharesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryPreferredSharesLineItems" xlink:to="lab_ptv_SubsidiaryPreferredSharesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GainOnDeconsolidationLineItems_b8eace36-30b6-4ffa-83cf-0437a309d011_terseLabel_en-US" xlink:label="lab_ptv_GainOnDeconsolidationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation [Line Items]</link:label>
    <link:label id="lab_ptv_GainOnDeconsolidationLineItems_label_en-US" xlink:label="lab_ptv_GainOnDeconsolidationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation [Line Items]</link:label>
    <link:label id="lab_ptv_GainOnDeconsolidationLineItems_documentation_en-US" xlink:label="lab_ptv_GainOnDeconsolidationLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainOnDeconsolidationLineItems" xlink:href="ptv-20211231.xsd#ptv_GainOnDeconsolidationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GainOnDeconsolidationLineItems" xlink:to="lab_ptv_GainOnDeconsolidationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate_72866cda-85d0-43b7-82ac-ce32c8ae09ee_terseLabel_en-US" xlink:label="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effects of state tax rate in US</link:label>
    <link:label id="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effects of state tax rate in US, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effects of state tax rate in US, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_EffectsOfStateTaxRateInUSReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityMember_739bb333-2577-452e-85f1-195930e47e64_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity [member]</link:label>
    <link:label id="lab_ifrs-full_EquityMember_label_en-US" xlink:label="lab_ifrs-full_EquityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity [member]</link:label>
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    <link:label id="lab_ptv_NetAssetsAttributableToShareholdersOfAssociate_e8af0903-502e-4289-a1a0-4c7d45b9b823_terseLabel_en-US" xlink:label="lab_ptv_NetAssetsAttributableToShareholdersOfAssociate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets attributable to shareholders</link:label>
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    <link:label id="lab_ptv_PureTechSecuritiesIICorpMember_11e7f734-e473-486a-b4f2-e0a074201dae_verboseLabel_en-US" xlink:label="lab_ptv_PureTechSecuritiesIICorpMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Securities II Corp.</link:label>
    <link:label id="lab_ptv_PureTechSecuritiesIICorpMember_label_en-US" xlink:label="lab_ptv_PureTechSecuritiesIICorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Securities II Corp. [Member]</link:label>
    <link:label id="lab_ptv_PureTechSecuritiesIICorpMember_documentation_en-US" xlink:label="lab_ptv_PureTechSecuritiesIICorpMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech Securities II Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PureTechSecuritiesIICorpMember" xlink:href="ptv-20211231.xsd#ptv_PureTechSecuritiesIICorpMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PureTechSecuritiesIICorpMember" xlink:to="lab_ptv_PureTechSecuritiesIICorpMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_19e1cb6c-c75b-456d-94c2-c410b0adda2d_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2025</link:label>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_c6ddfcdd-b245-4eaa-bd88-b9d14d66e9f3_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Three to four years</link:label>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than three years and not later than four years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:to="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AtFairValueMember_2b65ce53-dccb-4d9a-84a2-a9d8627ad1af_terseLabel_en-US" xlink:label="lab_ifrs-full_AtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">At fair value [member]</link:label>
    <link:label id="lab_ifrs-full_AtFairValueMember_label_en-US" xlink:label="lab_ifrs-full_AtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">At fair value [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AtFairValueMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AtFairValueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AtFairValueMember" xlink:to="lab_ifrs-full_AtFairValueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_56bd965a-394b-4fe5-b4a2-4738b797ed99_terseLabel_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_label_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode" xlink:to="lab_dei_EntityIncorporationStateCountryCode" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MajorCustomersMember_b92811ec-93d0-45f7-a8f9-409c9cf478c6_terseLabel_en-US" xlink:label="lab_ifrs-full_MajorCustomersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customers over 10% of revenue</link:label>
    <link:label id="lab_ifrs-full_MajorCustomersMember_0bf9742e-833d-462d-8e9e-23c1dc5059c4_verboseLabel_en-US" xlink:label="lab_ifrs-full_MajorCustomersMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major Customers [member]</link:label>
    <link:label id="lab_ifrs-full_MajorCustomersMember_label_en-US" xlink:label="lab_ifrs-full_MajorCustomersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customers [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorCustomersMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MajorCustomersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MajorCustomersMember" xlink:to="lab_ifrs-full_MajorCustomersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SharePriceOfInvesteeShares_46ed5f68-0710-42ee-9248-69c52b90de20_verboseLabel_en-US" xlink:label="lab_ptv_SharePriceOfInvesteeShares" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share price of investee shares</link:label>
    <link:label id="lab_ptv_SharePriceOfInvesteeShares_label_en-US" xlink:label="lab_ptv_SharePriceOfInvesteeShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share price of investee shares</link:label>
    <link:label id="lab_ptv_SharePriceOfInvesteeShares_documentation_en-US" xlink:label="lab_ptv_SharePriceOfInvesteeShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share price of investee shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SharePriceOfInvesteeShares" xlink:href="ptv-20211231.xsd#ptv_SharePriceOfInvesteeShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SharePriceOfInvesteeShares" xlink:to="lab_ptv_SharePriceOfInvesteeShares" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_ContactPersonnelName_c7557445-61b4-4894-a7e7-e71925b017de_terseLabel_en-US" xlink:label="lab_dei_ContactPersonnelName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contact Personnel Name</link:label>
    <link:label id="lab_dei_ContactPersonnelName_label_en-US" xlink:label="lab_dei_ContactPersonnelName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contact Personnel Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelName" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_ContactPersonnelName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_ContactPersonnelName" xlink:to="lab_dei_ContactPersonnelName" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_f8686263-88cc-437a-a251-d8838584cde6_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk-free interest rate</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk free interest rate, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:to="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CashInvestmentInAssociate_3bea4d4e-7d72-4ddf-b27f-9d1ccda1f59d_terseLabel_en-US" xlink:label="lab_ptv_CashInvestmentInAssociate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash investment in Associate</link:label>
    <link:label id="lab_ptv_CashInvestmentInAssociate_label_en-US" xlink:label="lab_ptv_CashInvestmentInAssociate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash investment in Associate</link:label>
    <link:label id="lab_ptv_CashInvestmentInAssociate_documentation_en-US" xlink:label="lab_ptv_CashInvestmentInAssociate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash investment in Associate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CashInvestmentInAssociate" xlink:href="ptv-20211231.xsd#ptv_CashInvestmentInAssociate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CashInvestmentInAssociate" xlink:to="lab_ptv_CashInvestmentInAssociate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageAssumptionsAbstract_label_en-US" xlink:label="lab_ptv_WeightedAverageAssumptionsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average assumptions [Abstract]</link:label>
    <link:label id="lab_ptv_WeightedAverageAssumptionsAbstract_documentation_en-US" xlink:label="lab_ptv_WeightedAverageAssumptionsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payment - Weighted average assumptions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageAssumptionsAbstract" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageAssumptionsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageAssumptionsAbstract" xlink:to="lab_ptv_WeightedAverageAssumptionsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_64f5f8c3-fbb0-4f65-940a-262eb2a3cf5f_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TotalBusinessOrSourcingCompanyMember_f0499701-d529-423d-8868-afc8d2cee9fd_terseLabel_en-US" xlink:label="lab_ptv_TotalBusinessOrSourcingCompanyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Business Or Sourcing Company [Member]</link:label>
    <link:label id="lab_ptv_TotalBusinessOrSourcingCompanyMember_label_en-US" xlink:label="lab_ptv_TotalBusinessOrSourcingCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Business Or Sourcing Company [Member]</link:label>
    <link:label id="lab_ptv_TotalBusinessOrSourcingCompanyMember_documentation_en-US" xlink:label="lab_ptv_TotalBusinessOrSourcingCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Business Or Sourcing Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TotalBusinessOrSourcingCompanyMember" xlink:href="ptv-20211231.xsd#ptv_TotalBusinessOrSourcingCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TotalBusinessOrSourcingCompanyMember" xlink:to="lab_ptv_TotalBusinessOrSourcingCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SeriesA1PreferredMember_76aa6fa9-2615-46fa-82d6-2686cf7e8981_terseLabel_en-US" xlink:label="lab_ptv_SeriesA1PreferredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-1 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA1PreferredMember_label_en-US" xlink:label="lab_ptv_SeriesA1PreferredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-1 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA1PreferredMember_documentation_en-US" xlink:label="lab_ptv_SeriesA1PreferredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-1 Preferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SeriesA1PreferredMember" xlink:href="ptv-20211231.xsd#ptv_SeriesA1PreferredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SeriesA1PreferredMember" xlink:to="lab_ptv_SeriesA1PreferredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LoansToGovernmentMember_7431dd97-ed33-4a1d-a5ce-67f72e60bb1f_terseLabel_en-US" xlink:label="lab_ifrs-full_LoansToGovernmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">US treasuries [member]</link:label>
    <link:label id="lab_ifrs-full_LoansToGovernmentMember_label_en-US" xlink:label="lab_ifrs-full_LoansToGovernmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans to government [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansToGovernmentMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LoansToGovernmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LoansToGovernmentMember" xlink:to="lab_ifrs-full_LoansToGovernmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NumberOfSharesHeld_823c467c-e73f-4ddb-a764-cee030a2bb23_terseLabel_en-US" xlink:label="lab_ptv_NumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Shares Held</link:label>
    <link:label id="lab_ptv_NumberOfSharesHeld_label_en-US" xlink:label="lab_ptv_NumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Shares Held</link:label>
    <link:label id="lab_ptv_NumberOfSharesHeld_documentation_en-US" xlink:label="lab_ptv_NumberOfSharesHeld" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Shares Held</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfSharesHeld" xlink:href="ptv-20211231.xsd#ptv_NumberOfSharesHeld"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NumberOfSharesHeld" xlink:to="lab_ptv_NumberOfSharesHeld" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_63222017-7703-4f62-8b47-6ceeeb023b35_terseLabel_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions, net of transfers</link:label>
    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions other than through business combinations, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Level3OfFairValueHierarchyMember_c328906a-8ef0-4c9b-a977-0f3135c97edd_terseLabel_en-US" xlink:label="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 3 of fair value hierarchy [member]</link:label>
    <link:label id="lab_ifrs-full_Level3OfFairValueHierarchyMember_label_en-US" xlink:label="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 3 of fair value hierarchy [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Level3OfFairValueHierarchyMember" xlink:to="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionToCommon_d26de407-b4fe-4a55-b717-fc3fe0ae9e0a_terseLabel_en-US" xlink:label="lab_ptv_ConversionToCommon" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to common</link:label>
    <link:label id="lab_ptv_ConversionToCommon_label_en-US" xlink:label="lab_ptv_ConversionToCommon" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to common</link:label>
    <link:label id="lab_ptv_ConversionToCommon_documentation_en-US" xlink:label="lab_ptv_ConversionToCommon" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion to common</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionToCommon" xlink:href="ptv-20211231.xsd#ptv_ConversionToCommon"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConversionToCommon" xlink:to="lab_ptv_ConversionToCommon" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinanceCostExplanatory_2f8f5117-40a2-4921-86d7-72c7b2968762_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinanceCostExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance Cost, net</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinanceCostExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinanceCostExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of finance cost [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinanceCostExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfFinanceCostExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinanceCostExplanatory" xlink:to="lab_ifrs-full_DisclosureOfFinanceCostExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfAssociatesLineItems_cd46086f-558c-46e6-9573-9e23f4c7ea8c_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfAssociatesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of associates [Line Items]</link:label>
    <link:label id="lab_ptv_DisclosureOfAssociatesLineItems_label_en-US" xlink:label="lab_ptv_DisclosureOfAssociatesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of associates [Line Items]</link:label>
    <link:label id="lab_ptv_DisclosureOfAssociatesLineItems_documentation_en-US" xlink:label="lab_ptv_DisclosureOfAssociatesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfAssociatesLineItems" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfAssociatesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DisclosureOfAssociatesLineItems" xlink:to="lab_ptv_DisclosureOfAssociatesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterest_232ed232-d165-4de6-80be-01f76f7c06d3_terseLabel_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterest_label_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterest_documentation_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:href="ptv-20211231.xsd#ptv_ConsiderationForAcquiredNonControllingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:to="lab_ptv_ConsiderationForAcquiredNonControllingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_cea5bd84-f0e4-4e32-b27d-c1b2e20e8c67_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information about employees</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information about employees [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DrJohnLaMattinaIndividuallyMember_56efb17f-bd40-40b0-a101-b05d9904c1f4_terseLabel_en-US" xlink:label="lab_ptv_DrJohnLaMattinaIndividuallyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina (individually)</link:label>
    <link:label id="lab_ptv_DrJohnLaMattinaIndividuallyMember_label_en-US" xlink:label="lab_ptv_DrJohnLaMattinaIndividuallyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina (individually) [Member]</link:label>
    <link:label id="lab_ptv_DrJohnLaMattinaIndividuallyMember_documentation_en-US" xlink:label="lab_ptv_DrJohnLaMattinaIndividuallyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina (individually)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DrJohnLaMattinaIndividuallyMember" xlink:href="ptv-20211231.xsd#ptv_DrJohnLaMattinaIndividuallyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DrJohnLaMattinaIndividuallyMember" xlink:to="lab_ptv_DrJohnLaMattinaIndividuallyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansLineItems_0bafe05e-2c9d-45b3-be1a-2182f273e63f_terseLabel_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans [Line Items]</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansLineItems_label_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans [Line Items]</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansLineItems_documentation_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SignificantSubsidiaryPlansLineItems" xlink:href="ptv-20211231.xsd#ptv_SignificantSubsidiaryPlansLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SignificantSubsidiaryPlansLineItems" xlink:to="lab_ptv_SignificantSubsidiaryPlansLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_StockOptionsMember_346d0b27-361c-4350-a63a-7b2a1f5baa75_terseLabel_en-US" xlink:label="lab_ptv_StockOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Options [Member]</link:label>
    <link:label id="lab_ptv_StockOptionsMember_label_en-US" xlink:label="lab_ptv_StockOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Options [Member]</link:label>
    <link:label id="lab_ptv_StockOptionsMember_documentation_en-US" xlink:label="lab_ptv_StockOptionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_StockOptionsMember" xlink:href="ptv-20211231.xsd#ptv_StockOptionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_StockOptionsMember" xlink:to="lab_ptv_StockOptionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract_label_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transactions - Key Management Personnel Compensation [Abstract]</link:label>
    <link:label id="lab_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract_documentation_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transactions - Key Management Personnel Compensation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract" xlink:href="ptv-20211231.xsd#ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract" xlink:to="lab_ptv_RelatedPartyTransactionsKeyManagementPersonnelCompensationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_d80c7c24-0f03-47fc-a034-822c8e979615_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OperatingExpensesTable_0f88780a-a916-47f5-9a0f-4c73df471271_terseLabel_en-US" xlink:label="lab_ptv_OperatingExpensesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses [Table]</link:label>
    <link:label id="lab_ptv_OperatingExpensesTable_label_en-US" xlink:label="lab_ptv_OperatingExpensesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses [Table]</link:label>
    <link:label id="lab_ptv_OperatingExpensesTable_documentation_en-US" xlink:label="lab_ptv_OperatingExpensesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OperatingExpensesTable" xlink:href="ptv-20211231.xsd#ptv_OperatingExpensesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OperatingExpensesTable" xlink:to="lab_ptv_OperatingExpensesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CommitmentsAndContingenciesAbstract_label_en-US" xlink:label="lab_ptv_CommitmentsAndContingenciesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments And Contingencies [Abstract]</link:label>
    <link:label id="lab_ptv_CommitmentsAndContingenciesAbstract_documentation_en-US" xlink:label="lab_ptv_CommitmentsAndContingenciesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments And Contingencies [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CommitmentsAndContingenciesAbstract" xlink:href="ptv-20211231.xsd#ptv_CommitmentsAndContingenciesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CommitmentsAndContingenciesAbstract" xlink:to="lab_ptv_CommitmentsAndContingenciesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GrossPrincipal_801d7c35-c719-4ad7-b952-381fe5d3331c_terseLabel_en-US" xlink:label="lab_ptv_GrossPrincipal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Principal</link:label>
    <link:label id="lab_ptv_GrossPrincipal_label_en-US" xlink:label="lab_ptv_GrossPrincipal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Principal</link:label>
    <link:label id="lab_ptv_GrossPrincipal_documentation_en-US" xlink:label="lab_ptv_GrossPrincipal" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Principal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GrossPrincipal" xlink:href="ptv-20211231.xsd#ptv_GrossPrincipal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GrossPrincipal" xlink:to="lab_ptv_GrossPrincipal" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards_a7deebbb-60c2-45a7-9326-7f588c160839_terseLabel_en-US" xlink:label="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassification of equity settled awards to liability awards</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards_label_en-US" xlink:label="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease in reclassification of equity settled awards into liability awards</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards_documentation_en-US" xlink:label="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease in reclassification of equity settled awards into liability awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:href="ptv-20211231.xsd#ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:to="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_330823f1-3141-44e5-b57e-92032603dc3d_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of net (income)/loss of associates accounted for using the equity method</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for undistributed profits of investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019_30775ca9-59b1-468a-9bdb-3db4faed2b55_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share price at grant date</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average share price, share options granted</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_894113ac-acac-4c05-9edd-da34e39919c6_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_1903bf10-7cf5-4126-b824-b5d2d006d966_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of intangible assets other than goodwill [axis]</link:label>
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    <link:label id="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock_db460f01-ca5a-42fc-bddc-e88cd8c5ffbb_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Lease Liabilities</link:label>
    <link:label id="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Lease Liabilities [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfLeaseLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Lease Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfLeaseLiabilitiesTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfLeaseLiabilitiesTextBlock"/>
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    <link:label id="lab_ptv_TotalFinanceIncomeCost_200272ca-fb58-45b8-8f1f-174fa27aea45_terseLabel_en-US" xlink:label="lab_ptv_TotalFinanceIncomeCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total finance income/(costs)</link:label>
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    <link:label id="lab_ptv_TotalFinanceIncomeCost_documentation_en-US" xlink:label="lab_ptv_TotalFinanceIncomeCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Finance Income Cost</link:label>
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    <link:label id="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock_02240de7-d5c2-41cd-a2c8-8e4352ef23c5_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of estimated useful life of assets</link:label>
    <link:label id="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of estimated useful life of assets [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of estimated useful life of assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfEstimatedUsefulLifeOfAssetsTextBlock"/>
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    <link:label id="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate_4b8f8e02-6882-4870-a3ee-983a142c0667_terseLabel_en-US" xlink:label="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) &#8211; fair value accounting</link:label>
    <link:label id="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of finance income costs - fair value accounting, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of finance income costs - fair value accounting, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_RateOfFinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AuditOfFinancialStatementsOfAssociates_3bf508da-702b-4a49-b7d1-241f58886173_terseLabel_en-US" xlink:label="lab_ptv_AuditOfFinancialStatementsOfAssociates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of financial statements of associates</link:label>
    <link:label id="lab_ptv_AuditOfFinancialStatementsOfAssociates_label_en-US" xlink:label="lab_ptv_AuditOfFinancialStatementsOfAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of financial statements of associates</link:label>
    <link:label id="lab_ptv_AuditOfFinancialStatementsOfAssociates_documentation_en-US" xlink:label="lab_ptv_AuditOfFinancialStatementsOfAssociates" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of financial statements of associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AuditOfFinancialStatementsOfAssociates" xlink:href="ptv-20211231.xsd#ptv_AuditOfFinancialStatementsOfAssociates"/>
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    <link:label id="lab_ifrs-full_FinanceLeaseReceivables_ef028ef5-c8be-43cd-91ae-26ae397ca0f3_totalLabel_en-US" xlink:label="lab_ifrs-full_FinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Lease Receivable</link:label>
    <link:label id="lab_ifrs-full_FinanceLeaseReceivables_label_en-US" xlink:label="lab_ifrs-full_FinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance lease receivables</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceLeaseReceivables" xlink:to="lab_ifrs-full_FinanceLeaseReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_KarunaMember_565afdbb-2554-4f86-a21a-4068a148b87e_verboseLabel_en-US" xlink:label="lab_ptv_KarunaMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Karuna Therapeutics, Inc.</link:label>
    <link:label id="lab_ptv_KarunaMember_e33d973b-2d70-460e-8943-e2c32c5879b6_terseLabel_en-US" xlink:label="lab_ptv_KarunaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Karuna [Member]</link:label>
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    <link:label id="lab_ptv_KarunaMember_documentation_en-US" xlink:label="lab_ptv_KarunaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Karuna</link:label>
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    <link:label id="lab_ifrs-full_RetainedEarningsMember_fae23256-7282-4c77-9c61-2835987a81d3_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retained earnings/ (accumulated deficit) [member]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_3275cf74-1d92-45bb-9afd-095e62a324bf_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected volatility</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected volatility, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted"/>
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    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_46a8d59c-f887-494a-8140-e68c97b33279_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">More than five years</link:label>
    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than five years [member]</link:label>
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    <link:label id="lab_ptv_EarningsCategoryAxis_d9b90e1a-6651-44ef-a4e0-7a7e766695ac_terseLabel_en-US" xlink:label="lab_ptv_EarningsCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Category Axis [Axis]</link:label>
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    <link:label id="lab_ptv_EarningsCategoryAxis_documentation_en-US" xlink:label="lab_ptv_EarningsCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Category</link:label>
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    <link:label id="lab_ifrs-full_OtherCurrentLiabilities_3dbe0fae-2b69-4094-82cd-5ff238ad6de3_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current liabilities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentLiabilities" xlink:to="lab_ifrs-full_OtherCurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock_173a25fc-1719-4234-ba93-c3942da13687_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Subsidiary Share-based Payments</link:label>
    <link:label id="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Subsidiary Share-based Payment Plans [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfSubsidiaryShareBasedPaymentPlansTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Subsidiary Share-based Payment Plans</link:label>
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    <link:label id="lab_ptv_WeightedAverageOptionsExercisedTable_b346df0a-2b21-4ebd-8d1b-f348602cb7cb_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsExercisedTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options exercised [Table]</link:label>
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    <link:label id="lab_ptv_ShareBasedPaymentArrangementCashUsedToSettleAward_0eadd30d-587d-4f74-baaa-4dbbc916ce4b_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentArrangementCashUsedToSettleAward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payment arrangement, cash settlement value</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentArrangementCashUsedToSettleAward" xlink:to="lab_ptv_ShareBasedPaymentArrangementCashUsedToSettleAward" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_edb5de9f-ae0c-4599-ad2a-7be67c606d2c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital and Financial Risk Management</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial risk management [text block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:to="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_689486b7-e2ba-406b-9f16-c2690dd4649f_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of changes in equity [line items]</link:label>
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    <link:label id="lab_ifrs-full_CurrentAssetsAbstract_fbf26383-b518-4148-b4f6-40237d623a57_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_CurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets [abstract]</link:label>
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    <link:label id="lab_ptv_ShareBasedLiabiltyAwardsMember_67b0c833-e99f-4a3a-9468-fb3b062c8c49_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedLiabiltyAwardsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share based liabilty awards</link:label>
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    <link:label id="lab_ptv_GainLossOnLossOfSignificantInfluence_547987af-70cc-4b79-9b8d-ead8d1a38d85_terseLabel_en-US" xlink:label="lab_ptv_GainLossOnLossOfSignificantInfluence" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on loss of significant influence</link:label>
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    <link:label id="lab_ptv_StateMember_f0a906dc-8dd9-4b1f-bf39-404f29dee830_terseLabel_en-US" xlink:label="lab_ptv_StateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">State [Member]</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForFairValueGainsLosses_ad871130-824a-4cc2-90ac-52c690d84777_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">(Gain)/loss on investments held at fair value</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:to="lab_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_fc9e28a3-c6cd-4290-bfe1-c9c57b2ad30e_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease liability, non-current</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_71da35dd-6f6f-4670-a7a2-cd1579384e0f_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term Portion of Lease Liability</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLeaseLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NoncurrentLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLeaseLiabilities" xlink:to="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost_f002e196-08a9-406d-804a-01a3a9137241_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, number of shares received for additional cost</link:label>
    <link:label id="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost_label_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Number of Shares received for additional cost</link:label>
    <link:label id="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost_documentation_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Number of Shares received for additional cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:href="ptv-20211231.xsd#ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:to="lab_ptv_BusinessCombinationNumberOfSharesReceivedForAdditionalCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExpectedDividendShareOptionsGranted_eb5531d5-1cab-4257-8a44-05c6a1205993_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpectedDividendShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected dividend yield</link:label>
    <link:label id="lab_ifrs-full_ExpectedDividendShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_ExpectedDividendShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected dividend, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedDividendShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ExpectedDividendShareOptionsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExpectedDividendShareOptionsGranted" xlink:to="lab_ifrs-full_ExpectedDividendShareOptionsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue_271da5e1-85da-43fb-89e2-1b640d89249f_terseLabel_en-US" xlink:label="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of associate's common stock held at fair value</link:label>
    <link:label id="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue_label_en-US" xlink:label="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of associate common stock held at fair value</link:label>
    <link:label id="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue_documentation_en-US" xlink:label="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of associate common stock held at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:href="ptv-20211231.xsd#ptv_NumberOfAssociateCommonStockHeldAtFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:to="lab_ptv_NumberOfAssociateCommonStockHeldAtFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ResearchAndDevelopmentMember_6a4eba32-46c2-4d7b-9f01-c5ed291f61b7_terseLabel_en-US" xlink:label="lab_ptv_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Research And Development [Member]</link:label>
    <link:label id="lab_ptv_ResearchAndDevelopmentMember_label_en-US" xlink:label="lab_ptv_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Research And Development [Member]</link:label>
    <link:label id="lab_ptv_ResearchAndDevelopmentMember_documentation_en-US" xlink:label="lab_ptv_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Research And Development</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ResearchAndDevelopmentMember" xlink:href="ptv-20211231.xsd#ptv_ResearchAndDevelopmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ResearchAndDevelopmentMember" xlink:to="lab_ptv_ResearchAndDevelopmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SeriesA3PreferredMember_48961fe1-8cac-4623-8598-98cadcc98269_terseLabel_en-US" xlink:label="lab_ptv_SeriesA3PreferredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-3 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA3PreferredMember_label_en-US" xlink:label="lab_ptv_SeriesA3PreferredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-3 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesA3PreferredMember_documentation_en-US" xlink:label="lab_ptv_SeriesA3PreferredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-3 Preferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SeriesA3PreferredMember" xlink:href="ptv-20211231.xsd#ptv_SeriesA3PreferredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SeriesA3PreferredMember" xlink:to="lab_ptv_SeriesA3PreferredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_e64f3f68-c3c9-428c-ae03-7baad397a187_terseLabel_en-US" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">US federal statutory rate</link:label>
    <link:label id="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax expense (income) at applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TaxExpenseIncomeAtApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:to="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment_589d76a1-af45-41de-a890-91eb490cf901_terseLabel_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, second installment</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment_label_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, second installment</link:label>
    <link:label id="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment_documentation_en-US" xlink:label="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration for acquired non-controlling interest, second installment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:href="ptv-20211231.xsd#ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:to="lab_ptv_ConsiderationForAcquiredNonControllingInterestSecondInstallment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherReserves_1cd651da-c54a-4757-9c5e-5347a3381cfd_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherReserves" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other reserves</link:label>
    <link:label id="lab_ifrs-full_OtherReserves_label_en-US" xlink:label="lab_ifrs-full_OtherReserves" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other reserves</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherReserves"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherReserves" xlink:to="lab_ifrs-full_OtherReserves" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansAbstract_ce0c98d8-259c-4eb7-b554-53699fa77972_terseLabel_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans [Abstract]</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansAbstract_label_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans [Abstract]</link:label>
    <link:label id="lab_ptv_SignificantSubsidiaryPlansAbstract_documentation_en-US" xlink:label="lab_ptv_SignificantSubsidiaryPlansAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Subsidiary Plans</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SignificantSubsidiaryPlansAbstract" xlink:href="ptv-20211231.xsd#ptv_SignificantSubsidiaryPlansAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SignificantSubsidiaryPlansAbstract" xlink:to="lab_ptv_SignificantSubsidiaryPlansAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_4f938042-6bdf-4797-a9f8-a0d05ae9f0a9_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for segment consolidation items [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for segment consolidation items [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:to="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfCustomersMember_3383adbf-dfeb-4770-864f-7f94a1682b14_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfCustomersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of customers [member]</link:label>
    <link:label id="lab_ifrs-full_TypesOfCustomersMember_label_en-US" xlink:label="lab_ifrs-full_TypesOfCustomersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of customers [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TypesOfCustomersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfCustomersMember" xlink:to="lab_ifrs-full_TypesOfCustomersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DeferredRevenueMember_80096ba0-6e96-49f9-be45-b43213326515_terseLabel_en-US" xlink:label="lab_ptv_DeferredRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_ptv_DeferredRevenueMember_label_en-US" xlink:label="lab_ptv_DeferredRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenue [Member]</link:label>
    <link:label id="lab_ptv_DeferredRevenueMember_documentation_en-US" xlink:label="lab_ptv_DeferredRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DeferredRevenueMember" xlink:href="ptv-20211231.xsd#ptv_DeferredRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DeferredRevenueMember" xlink:to="lab_ptv_DeferredRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinanceIncomecostsAbstract_dd789e99-815b-4694-9f96-7012ee72e5d3_terseLabel_en-US" xlink:label="lab_ptv_FinanceIncomecostsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs):</link:label>
    <link:label id="lab_ptv_FinanceIncomecostsAbstract_label_en-US" xlink:label="lab_ptv_FinanceIncomecostsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) [Abstract]</link:label>
    <link:label id="lab_ptv_FinanceIncomecostsAbstract_documentation_en-US" xlink:label="lab_ptv_FinanceIncomecostsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinanceIncomecostsAbstract" xlink:href="ptv-20211231.xsd#ptv_FinanceIncomecostsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinanceIncomecostsAbstract" xlink:to="lab_ptv_FinanceIncomecostsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SaleOfEquityInstrumentsInOtherEntities_17515cf9-e995-4764-989d-b5e8dd0405f7_terseLabel_en-US" xlink:label="lab_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of equity instruments in other entities</link:label>
    <link:label id="lab_ptv_SaleOfEquityInstrumentsInOtherEntities_label_en-US" xlink:label="lab_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of equity instruments in other entities</link:label>
    <link:label id="lab_ptv_SaleOfEquityInstrumentsInOtherEntities_documentation_en-US" xlink:label="lab_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of equity instruments in other entities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:href="ptv-20211231.xsd#ptv_SaleOfEquityInstrumentsInOtherEntities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:to="lab_ptv_SaleOfEquityInstrumentsInOtherEntities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CommitmentsAndContingenciesTable_30051410-e6e3-4cca-9612-814852ebbe73_terseLabel_en-US" xlink:label="lab_ptv_CommitmentsAndContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and Contingencies [Table]</link:label>
    <link:label id="lab_ptv_CommitmentsAndContingenciesTable_label_en-US" xlink:label="lab_ptv_CommitmentsAndContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and Contingencies [Table]</link:label>
    <link:label id="lab_ptv_CommitmentsAndContingenciesTable_documentation_en-US" xlink:label="lab_ptv_CommitmentsAndContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CommitmentsAndContingenciesTable" xlink:href="ptv-20211231.xsd#ptv_CommitmentsAndContingenciesTable"/>
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    <link:label id="lab_ptv_TradeAndOtherReceivablesNotImpairedAbstract_c26a7b49-9389-4dbf-93fd-bc1eb312c0bb_terseLabel_en-US" xlink:label="lab_ptv_TradeAndOtherReceivablesNotImpairedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Neither past due nor impaired [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_31491195-032e-4bd7-af53-55edec3bfc1e_totalLabel_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total other comprehensive income/(loss)</link:label>
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    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_7238dce5-4bc2-4681-8c7d-7ee634c02e71_totalLabel_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average effective tax rate</link:label>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_label_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average effective tax rate</link:label>
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    <link:label id="lab_ptv_TradeAndOtherReceivablesNotImpairedTable_0812a9c0-58ec-41a3-90bd-ceddf52e01fb_terseLabel_en-US" xlink:label="lab_ptv_TradeAndOtherReceivablesNotImpairedTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other receivables not impaired [Table]</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_25a85702-3535-44cb-84b9-e87112c16c0e_periodStartLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted-average exercise price, beginning of year (GBP)</link:label>
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    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_e8c972fb-2872-4ce2-b787-6e42f02732f5_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of property and equipment</link:label>
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    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_d879ffab-8f60-4c84-bee5-fbf37dbf231b_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_ptv_NotLaterThan10YearsMember_6b49773e-8037-4c90-9d79-b9c71455fbec_terseLabel_en-US" xlink:label="lab_ptv_NotLaterThan10YearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not later than 10 years</link:label>
    <link:label id="lab_ptv_NotLaterThan10YearsMember_label_en-US" xlink:label="lab_ptv_NotLaterThan10YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not later than 10 years [Member]</link:label>
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    <link:label id="lab_ptv_PureTechLYT100Member_2cefa7bf-7361-4461-9577-f92c2311871f_verboseLabel_en-US" xlink:label="lab_ptv_PureTechLYT100Member" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PureTech LYT-100</link:label>
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    <link:label id="lab_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities_af88ee29-f28a-49e6-b4f5-7d492f2c46d5_terseLabel_en-US" xlink:label="lab_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments in respect of developmental milestones, dependent on events outside control of company, but reasonably possible to occur</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EstimatedFinancialEffectOfContingentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities" xlink:to="lab_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock_a1294d71-ea75-4524-8007-bb070ad3f67e_terseLabel_en-US" xlink:label="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Subsidiary preferred shares, Minimum liquidation preference</link:label>
    <link:label id="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock_label_en-US" xlink:label="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Minimum liquidation preference [Text Block]</link:label>
    <link:label id="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Minimum liquidation preference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:href="ptv-20211231.xsd#ptv_SummaryOfMinimumLiquidationPreferenceTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:to="lab_ptv_SummaryOfMinimumLiquidationPreferenceTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ResearchAndDevelopmentExpense_92d6aa66-dfeb-4334-b7b8-4299e0496531_terseLabel_en-US" xlink:label="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Research and development expenses</link:label>
    <link:label id="lab_ifrs-full_ResearchAndDevelopmentExpense_label_en-US" xlink:label="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Research and development expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ResearchAndDevelopmentExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ResearchAndDevelopmentExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ResearchAndDevelopmentExpense" xlink:to="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CustomerDMember_dde9bf79-aa9d-4646-b2a9-546dbc5a5918_terseLabel_en-US" xlink:label="lab_ptv_CustomerDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer D</link:label>
    <link:label id="lab_ptv_CustomerDMember_label_en-US" xlink:label="lab_ptv_CustomerDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer D [Member]</link:label>
    <link:label id="lab_ptv_CustomerDMember_documentation_en-US" xlink:label="lab_ptv_CustomerDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer D</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CustomerDMember" xlink:href="ptv-20211231.xsd#ptv_CustomerDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CustomerDMember" xlink:to="lab_ptv_CustomerDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TaxEffectOfTaxLosses_009543ef-041a-40f5-8feb-bf95dc3c2168_terseLabel_en-US" xlink:label="lab_ifrs-full_TaxEffectOfTaxLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current year losses for which no deferred tax asset is recognized</link:label>
    <link:label id="lab_ifrs-full_TaxEffectOfTaxLosses_label_en-US" xlink:label="lab_ifrs-full_TaxEffectOfTaxLosses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax effect of tax losses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TaxEffectOfTaxLosses" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TaxEffectOfTaxLosses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TaxEffectOfTaxLosses" xlink:to="lab_ifrs-full_TaxEffectOfTaxLosses" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentLineItems_05852de1-1577-4e1f-89ae-349ac7f2dc74_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment [Line Items]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentLineItems_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment [Line Items]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentLineItems_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentLineItems" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentLineItems" xlink:to="lab_ptv_ShareBasedPaymentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities_5c1f1b3a-d0db-4bc1-b6b3-bcaeb4656373_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases of short-term investments</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of financial instruments, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AccruedInterestContractual_18878d0c-a5f3-494a-ab44-a42e574768dc_terseLabel_en-US" xlink:label="lab_ptv_AccruedInterestContractual" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest - contractual</link:label>
    <link:label id="lab_ptv_AccruedInterestContractual_label_en-US" xlink:label="lab_ptv_AccruedInterestContractual" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest - contractual</link:label>
    <link:label id="lab_ptv_AccruedInterestContractual_documentation_en-US" xlink:label="lab_ptv_AccruedInterestContractual" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest - contractual</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AccruedInterestContractual" xlink:href="ptv-20211231.xsd#ptv_AccruedInterestContractual"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AccruedInterestContractual" xlink:to="lab_ptv_AccruedInterestContractual" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_5ce3d89d-ec8b-4303-a65d-4fd0f5647bd2_periodStartLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at beginning of period before allocation of associate loss to long-term interest</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_47975bc0-f824-4e87-a5c8-ef306854d6e3_periodEndLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at end of period before allocation of associate loss to long-term interest</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_8107f45f-9fa8-43b6-b899-1e34ce09d4f2_verboseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, at fair value</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_2ff49253-c385-461b-8c88-5d1fa8f29b5a_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_FinancialAssetsAtFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssetsAtFairValue" xlink:to="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_83d93213-574f-4c51-b2a2-129cc015048c_verboseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise of share-based awards (in shares)</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_5890ed42-0907-45ec-8ea1-73087dda1699_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of shares issued</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) in number of ordinary shares issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:to="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares_f9cf3c3e-25a3-4b54-a1d9-d72ed8bc445a_terseLabel_en-US" xlink:label="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) &#8211; subsidiary preferred shares</link:label>
    <link:label id="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares_cdcee35c-0123-40a1-9b2d-e6f94dd83c80_totalLabel_en-US" xlink:label="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total finance costs &#8211; subsidiary preferred shares</link:label>
    <link:label id="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares_label_en-US" xlink:label="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) - subsidiary preferred shares</link:label>
    <link:label id="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares_documentation_en-US" xlink:label="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) - subsidiary preferred shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:href="ptv-20211231.xsd#ptv_FinanceIncomecostsSubsidiaryPreferredShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:to="lab_ptv_FinanceIncomecostsSubsidiaryPreferredShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_fe54304f-deaa-4454-871d-49a722e1be96_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity settled share-based awards</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through share-based payment transactions, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherIncome_2b149e86-f520-4cf2-8a37-60adc8cb4d54_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other income/(expense)</link:label>
    <link:label id="lab_ifrs-full_OtherIncome_label_en-US" xlink:label="lab_ifrs-full_OtherIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherIncome" xlink:to="lab_ifrs-full_OtherIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract_5ce23918-fc54-4d38-a00d-553d24873cbe_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about borrowings [abstract]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about borrowings [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SeriesC2PreferredMember_084a1745-c57b-405c-88f0-06d2b0467d5a_terseLabel_en-US" xlink:label="lab_ptv_SeriesC2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series C-2 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesC2PreferredMember_label_en-US" xlink:label="lab_ptv_SeriesC2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series C-2 Preferred [Member]</link:label>
    <link:label id="lab_ptv_SeriesC2PreferredMember_documentation_en-US" xlink:label="lab_ptv_SeriesC2PreferredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series C-2 Preferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SeriesC2PreferredMember" xlink:href="ptv-20211231.xsd#ptv_SeriesC2PreferredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SeriesC2PreferredMember" xlink:to="lab_ptv_SeriesC2PreferredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DilutedMember_96520426-a62e-430d-ae89-2a1a9c33ceb6_terseLabel_en-US" xlink:label="lab_ptv_DilutedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Diluted [Member]</link:label>
    <link:label id="lab_ptv_DilutedMember_label_en-US" xlink:label="lab_ptv_DilutedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Diluted [Member]</link:label>
    <link:label id="lab_ptv_DilutedMember_documentation_en-US" xlink:label="lab_ptv_DilutedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Diluted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DilutedMember" xlink:href="ptv-20211231.xsd#ptv_DilutedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DilutedMember" xlink:to="lab_ptv_DilutedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsExercisableAbstract_feccba35-cad1-4147-9789-d9e1405a94da_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsExercisableAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options exercisable [Abstract]</link:label>
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    <link:label id="lab_ptv_WeightedAverageOptionsExercisableAbstract_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsExercisableAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options exercisable</link:label>
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    <link:label id="lab_ifrs-full_IssueOfConvertibleInstruments_c9afc223-1017-4039-8753-2e4c99f3b757_terseLabel_en-US" xlink:label="lab_ifrs-full_IssueOfConvertibleInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issue of convertible instruments</link:label>
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    <link:label id="lab_ptv_DisclosureOfInformationOfEmployeesTable_30d14783-c251-451a-8913-3a6973eb4a29_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfInformationOfEmployeesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information of employees [Table]</link:label>
    <link:label id="lab_ptv_DisclosureOfInformationOfEmployeesTable_label_en-US" xlink:label="lab_ptv_DisclosureOfInformationOfEmployeesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information of employees [Table]</link:label>
    <link:label id="lab_ptv_DisclosureOfInformationOfEmployeesTable_documentation_en-US" xlink:label="lab_ptv_DisclosureOfInformationOfEmployeesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information of employees [Table]</link:label>
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    <link:label id="lab_ptv_BorrowingsAccruedInterest_557fc3eb-bd0b-42ab-94f0-aa0ccbbfd9d3_terseLabel_en-US" xlink:label="lab_ptv_BorrowingsAccruedInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest</link:label>
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    <link:label id="lab_ptv_BorrowingsAccruedInterest_documentation_en-US" xlink:label="lab_ptv_BorrowingsAccruedInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, Accrued Interest</link:label>
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    <link:label id="lab_ptv_ScheduleOfEarningsPerShareTextBlock_2c5450ed-52ed-466d-b872-43c31103f896_terseLabel_en-US" xlink:label="lab_ptv_ScheduleOfEarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Earnings/(Loss) per Share</link:label>
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    <link:label id="lab_ptv_ScheduleOfEarningsPerShareTextBlock_documentation_en-US" xlink:label="lab_ptv_ScheduleOfEarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Earnings per Share</link:label>
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    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_6cca5a7a-b260-4837-ad4c-7d3683e2072b_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidated Statements of Financial Position</link:label>
    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of financial position [abstract]</link:label>
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    <link:label id="lab_srt_MinimumMember_80c22622-8858-4a7d-88ad-d7f767322c75_terseLabel_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_srt_MinimumMember_label_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum [Member]</link:label>
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    <link:label id="lab_ifrs-full_NonadjustingEventsMember_4088d438-1086-43f2-8ab6-749ecf3fb726_terseLabel_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-adjusting events after reporting period [member]</link:label>
    <link:label id="lab_ifrs-full_NonadjustingEventsMember_label_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-adjusting events after reporting period [member]</link:label>
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    <link:label id="lab_ifrs-full_IncomeApproachMember_28b0d734-6d50-4c06-b8a6-9420f63e4602_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeApproachMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income &#8211; DCF &amp; OPM allocation</link:label>
    <link:label id="lab_ifrs-full_IncomeApproachMember_label_en-US" xlink:label="lab_ifrs-full_IncomeApproachMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income approach [member]</link:label>
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    <link:label id="lab_ifrs-full_LicencesMember_d4513e15-b4c1-4bae-8c2c-c698967f777c_terseLabel_en-US" xlink:label="lab_ifrs-full_LicencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Licences [member]</link:label>
    <link:label id="lab_ifrs-full_LicencesMember_label_en-US" xlink:label="lab_ifrs-full_LicencesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Licences [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LicencesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_LicencesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LicencesMember" xlink:to="lab_ifrs-full_LicencesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TotalOperatingExpenseMember_99afa938-3093-49bf-96cc-2c2f40dbb052_terseLabel_en-US" xlink:label="lab_ptv_TotalOperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Operating Expense [Member]</link:label>
    <link:label id="lab_ptv_TotalOperatingExpenseMember_label_en-US" xlink:label="lab_ptv_TotalOperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Operating Expense [Member]</link:label>
    <link:label id="lab_ptv_TotalOperatingExpenseMember_documentation_en-US" xlink:label="lab_ptv_TotalOperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Operating Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TotalOperatingExpenseMember" xlink:href="ptv-20211231.xsd#ptv_TotalOperatingExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TotalOperatingExpenseMember" xlink:to="lab_ptv_TotalOperatingExpenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets_ba27dc1e-a96c-4c66-94b6-e614cdb8d445_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(loss) on investments held at fair value</link:label>
    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets_b03d4ce5-f7fc-4cc9-97ea-ec7557032784_verboseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain/(Loss) on changes in fair value</link:label>
    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets_label_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) recognised in profit or loss excluding exchange differences, fair value measurement, assets</link:label>
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    <link:label id="lab_ifrs-full_RestrictedCashAndCashEquivalents_7a0fa348-20b1-4a12-975d-c002a611c799_verboseLabel_en-US" xlink:label="lab_ifrs-full_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other financial assets</link:label>
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    <link:label id="lab_ifrs-full_RestrictedCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted cash and cash equivalents</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_c0b17e58-42b3-4ddd-a1bb-d1489dc74d9d_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial assets [axis]</link:label>
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    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_3dabbe06-3d42-4f88-b6a6-65fb1e2c2a86_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued ordinary shares at January 1,</link:label>
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    <link:label id="lab_ptv_ConvertibleNotesRollForward_3cd3fb23-3636-448c-a193-54743932bea3_terseLabel_en-US" xlink:label="lab_ptv_ConvertibleNotesRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes [Roll Forward]</link:label>
    <link:label id="lab_ptv_ConvertibleNotesRollForward_label_en-US" xlink:label="lab_ptv_ConvertibleNotesRollForward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes [Roll Forward]</link:label>
    <link:label id="lab_ptv_ConvertibleNotesRollForward_documentation_en-US" xlink:label="lab_ptv_ConvertibleNotesRollForward" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConvertibleNotesRollForward" xlink:href="ptv-20211231.xsd#ptv_ConvertibleNotesRollForward"/>
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    <link:label id="lab_ifrs-full_RightofuseAssets_6a338f69-15d4-43e8-995c-450aa06abfad_terseLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right of use asset, net</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MeasurementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MeasurementAxis" xlink:to="lab_ifrs-full_MeasurementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems_c289fcef-1b9e-436b-9d1d-41380a618458_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:to="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_4dfe55fb-b597-410b-b379-193d4bc4857c_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) investing activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingLineItems_e6fa8931-7033-4826-8666-88fc37eca33e_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding [Line Items]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingLineItems_label_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding [Line Items]</link:label>
    <link:label id="lab_ptv_WeightedAverageOptionsOutstandingLineItems_documentation_en-US" xlink:label="lab_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Options Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageOptionsOutstandingLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:to="lab_ptv_WeightedAverageOptionsOutstandingLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_bda781da-2248-4349-ba56-d9d574b65fcb_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:to="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueAbstract_bb2f0aa3-da97-46b4-8aeb-2b3786e8fa4f_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue [abstract]</link:label>
    <link:label id="lab_ifrs-full_RevenueAbstract_label_en-US" xlink:label="lab_ifrs-full_RevenueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RevenueAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueAbstract" xlink:to="lab_ifrs-full_RevenueAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries_4adccf38-cf8e-4d61-a0a3-6d49257e3b38_terseLabel_en-US" xlink:label="lab_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition of a non-controlling Interest of a subsidiary</link:label>
    <link:label id="lab_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries_label_en-US" xlink:label="lab_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments from changes in ownership interests in subsidiaries that do not result in loss of control</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:to="lab_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_88bf8d57-9504-4eb7-a94b-95ae8b19696b_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentAssets" xlink:to="lab_ifrs-full_OtherNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OperatingExpensesAbstract_27780ac2-cbc8-4fd8-b582-a1c2461cd68b_terseLabel_en-US" xlink:label="lab_ptv_OperatingExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating expenses:</link:label>
    <link:label id="lab_ptv_OperatingExpensesAbstract_label_en-US" xlink:label="lab_ptv_OperatingExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:label id="lab_ptv_OperatingExpensesAbstract_documentation_en-US" xlink:label="lab_ptv_OperatingExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OperatingExpensesAbstract" xlink:href="ptv-20211231.xsd#ptv_OperatingExpensesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OperatingExpensesAbstract" xlink:to="lab_ptv_OperatingExpensesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MiscellaneousOtherOperatingExpense_8642f0c4-bec1-41ee-a932-088185826df7_totalLabel_en-US" xlink:label="lab_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total other operating expenses</link:label>
    <link:label id="lab_ifrs-full_MiscellaneousOtherOperatingExpense_label_en-US" xlink:label="lab_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Miscellaneous other operating expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MiscellaneousOtherOperatingExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:to="lab_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_TradeAndOtherPayablesMember_77647c03-ae1e-4bb8-b503-e6fd0ebe558e_terseLabel_en-US" xlink:label="lab_ptv_TradeAndOtherPayablesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other payables</link:label>
    <link:label id="lab_ptv_TradeAndOtherPayablesMember_label_en-US" xlink:label="lab_ptv_TradeAndOtherPayablesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other payables [Member]</link:label>
    <link:label id="lab_ptv_TradeAndOtherPayablesMember_documentation_en-US" xlink:label="lab_ptv_TradeAndOtherPayablesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TradeAndOtherPayablesMember" xlink:href="ptv-20211231.xsd#ptv_TradeAndOtherPayablesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TradeAndOtherPayablesMember" xlink:to="lab_ptv_TradeAndOtherPayablesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock_b4dc2b9a-c913-480d-868a-01dc4250fb54_terseLabel_en-US" xlink:label="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Trade And Other Payables</link:label>
    <link:label id="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock_label_en-US" xlink:label="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Trade And Other Payables [Text Block]</link:label>
    <link:label id="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock_documentation_en-US" xlink:label="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Trade And Other Payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:href="ptv-20211231.xsd#ptv_ScheduleOfTradeAndOtherPayablesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:to="lab_ptv_ScheduleOfTradeAndOtherPayablesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems_368714e9-0ff1-4cbc-9541-083c33c88b85_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial assets [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial assets [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:to="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxAssets_04f7f638-4aa7-4686-81de-5654ab778e26_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxAssets_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxAssets" xlink:to="lab_ifrs-full_DeferredTaxAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForSubsidiariesMember_57f6e25e-978f-4a68-bba8-d075f611b98a_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for subsidiaries [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForSubsidiariesMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for subsidiaries [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_EntitysTotalForSubsidiariesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:to="lab_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentExpenseTableTextBlock_877ab1e6-7604-413a-9d49-635a78496c9a_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Share-based Payment Expense Table</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentExpenseTableTextBlock_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Expense Table [Text Block]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentExpenseTableTextBlock_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Expense Table</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentExpenseTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:to="lab_ptv_ShareBasedPaymentExpenseTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate_3fb26913-793b-49d7-9528-017bd61406de_terseLabel_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non deductible share based payment expenses</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share based Payment expenses, non-deductible, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share based Payment expenses, non-deductible, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_ShareBasedPaymentExpensesNonDeductibleReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis_14f04dd3-b3d8-4ec0-b2ce-379e56465c3d_terseLabel_en-US" xlink:label="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Loss Carryforwards, Expiration Periods [Axis]</link:label>
    <link:label id="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis_label_en-US" xlink:label="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Loss Carryforwards, Expiration Periods [Axis]</link:label>
    <link:label id="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis_documentation_en-US" xlink:label="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Loss Carryforwards, Expiration Periods</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:href="ptv-20211231.xsd#ptv_OperatingLossCarryforwardsExpirationPeriodsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:to="lab_ptv_OperatingLossCarryforwardsExpirationPeriodsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_VestingOfRestrictedStockUnits_b4ca48b2-25c2-427e-aa76-966c7eb5b322_terseLabel_en-US" xlink:label="lab_ptv_VestingOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting of restricted stock units</link:label>
    <link:label id="lab_ptv_VestingOfRestrictedStockUnits_label_en-US" xlink:label="lab_ptv_VestingOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting of restricted stock units</link:label>
    <link:label id="lab_ptv_VestingOfRestrictedStockUnits_documentation_en-US" xlink:label="lab_ptv_VestingOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting of restricted stock units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_VestingOfRestrictedStockUnits" xlink:href="ptv-20211231.xsd#ptv_VestingOfRestrictedStockUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_VestingOfRestrictedStockUnits" xlink:to="lab_ptv_VestingOfRestrictedStockUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions_e308c5ce-0906-4648-a16a-944d0ce4c641_terseLabel_en-US" xlink:label="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liability for share based awards</link:label>
    <link:label id="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions_label_en-US" xlink:label="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non current Liabilities From Share based Payment Transactions</link:label>
    <link:label id="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions_documentation_en-US" xlink:label="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non current Liabilities From Share based Payment Transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:href="ptv-20211231.xsd#ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:to="lab_ptv_NonCurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationTable_59b3b9f5-844d-475a-8176-c84c3df42641_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document and Entity Information [Table]</link:label>
    <link:label id="lab_dei_DocumentInformationTable_label_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Information [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentInformationTable" xlink:to="lab_dei_DocumentInformationTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_00578a79-525a-4012-85e3-551025a1d309_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price, options exercised (GBP)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_bd494522-3bd6-479c-a09b-d8f0a11af9af_verboseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted-average exercise price $</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options exercised in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:to="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings_9c3b368f-8ec5-454d-868d-d7fd358c0465_terseLabel_en-US" xlink:label="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repayments of non-current borrowings</link:label>
    <link:label id="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repayments of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RepaymentsOfNoncurrentBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:to="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable_385ba168-0151-47a4-ba01-38af8fb9075e_terseLabel_en-US" xlink:label="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies - Property and Equipment [Table]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable_label_en-US" xlink:label="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies - Property and Equipment [Table]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable_documentation_en-US" xlink:label="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies - Property and Equipment [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:href="ptv-20211231.xsd#ptv_AccountingPoliciesPropertyAndEquipmentTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:to="lab_ptv_AccountingPoliciesPropertyAndEquipmentTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RevenueTable_7c1e11c6-e4ec-4af6-ae82-356d828007b8_terseLabel_en-US" xlink:label="lab_ptv_RevenueTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue [Table]</link:label>
    <link:label id="lab_ptv_RevenueTable_label_en-US" xlink:label="lab_ptv_RevenueTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue [Table]</link:label>
    <link:label id="lab_ptv_RevenueTable_documentation_en-US" xlink:label="lab_ptv_RevenueTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RevenueTable" xlink:href="ptv-20211231.xsd#ptv_RevenueTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RevenueTable" xlink:to="lab_ptv_RevenueTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfLeasesExplanatory_7a6d7787-2868-4e53-9be4-0e975fe206d2_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfLeasesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of leases [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfLeasesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfLeasesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfLeasesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_4886d61b-00d1-4c7a-87a6-fbd470da6c76_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrant liability</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current derivative financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentDerivativeFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:to="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_MarketPWERMAndHybridAllocationMember_92df91c5-e4b2-4279-8729-34add60e156a_terseLabel_en-US" xlink:label="lab_ptv_MarketPWERMAndHybridAllocationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market/Asset &#8211; PWERM &amp; Hybrid allocation</link:label>
    <link:label id="lab_ptv_MarketPWERMAndHybridAllocationMember_53666429-4dd8-4417-83b6-f9ea084f22a7_verboseLabel_en-US" xlink:label="lab_ptv_MarketPWERMAndHybridAllocationMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market &#8211; PWERM &amp; Hybrid allocation</link:label>
    <link:label id="lab_ptv_MarketPWERMAndHybridAllocationMember_label_en-US" xlink:label="lab_ptv_MarketPWERMAndHybridAllocationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market, PWERM and Hybrid allocation [Member]</link:label>
    <link:label id="lab_ptv_MarketPWERMAndHybridAllocationMember_documentation_en-US" xlink:label="lab_ptv_MarketPWERMAndHybridAllocationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market, PWERM and Hybrid allocation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_MarketPWERMAndHybridAllocationMember" xlink:href="ptv-20211231.xsd#ptv_MarketPWERMAndHybridAllocationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_MarketPWERMAndHybridAllocationMember" xlink:to="lab_ptv_MarketPWERMAndHybridAllocationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LongTermLoanMember_c0dee5bf-524a-4140-af02-378ba0f3f36d_verboseLabel_en-US" xlink:label="lab_ptv_LongTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan [Member]</link:label>
    <link:label id="lab_ptv_LongTermLoanMember_label_en-US" xlink:label="lab_ptv_LongTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan [Member]</link:label>
    <link:label id="lab_ptv_LongTermLoanMember_documentation_en-US" xlink:label="lab_ptv_LongTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LongTermLoanMember" xlink:href="ptv-20211231.xsd#ptv_LongTermLoanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LongTermLoanMember" xlink:to="lab_ptv_LongTermLoanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_d348d743-ea2c-41c5-8549-ebee3787d54b_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise of share-based awards</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through exercise of options, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Level2OfFairValueHierarchyMember_9e89151e-7298-4045-b3f1-6c18f84746f2_terseLabel_en-US" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 2 of fair value hierarchy [member]</link:label>
    <link:label id="lab_ifrs-full_Level2OfFairValueHierarchyMember_label_en-US" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 2 of fair value hierarchy [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Level2OfFairValueHierarchyMember" xlink:to="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_EntregaMember_40e0cb56-cfb7-449e-b23a-88426c4c7b37_verboseLabel_en-US" xlink:label="lab_ptv_EntregaMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega, Inc. (indirectly held through Enlight)</link:label>
    <link:label id="lab_ptv_EntregaMember_deea4d15-1ca4-4e5b-b422-5253046596e0_terseLabel_en-US" xlink:label="lab_ptv_EntregaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega</link:label>
    <link:label id="lab_ptv_EntregaMember_label_en-US" xlink:label="lab_ptv_EntregaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega [Member]</link:label>
    <link:label id="lab_ptv_EntregaMember_documentation_en-US" xlink:label="lab_ptv_EntregaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entrega</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EntregaMember" xlink:href="ptv-20211231.xsd#ptv_EntregaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_EntregaMember" xlink:to="lab_ptv_EntregaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AuditorsRemunerationForAuditServices_44621b8e-d39c-4233-ba18-8457e8d9a0b0_terseLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationForAuditServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit of these financial statements</link:label>
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    <link:label id="lab_ptv_MarketBacksolveAndOPMAllocationMember_21ba2239-a66e-4c4a-9816-b0aba0a9d8d2_terseLabel_en-US" xlink:label="lab_ptv_MarketBacksolveAndOPMAllocationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market &#8211; Backsolve &amp; OPM allocation</link:label>
    <link:label id="lab_ptv_MarketBacksolveAndOPMAllocationMember_label_en-US" xlink:label="lab_ptv_MarketBacksolveAndOPMAllocationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market, Backsolve and OPM allocation [Member]</link:label>
    <link:label id="lab_ptv_MarketBacksolveAndOPMAllocationMember_documentation_en-US" xlink:label="lab_ptv_MarketBacksolveAndOPMAllocationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market, Backsolve and OPM allocation</link:label>
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    <link:label id="lab_ptv_VedantaBiosciencesSecuritiesCorpMember_88e48bd8-39b2-4083-94c2-78c09aee7c34_verboseLabel_en-US" xlink:label="lab_ptv_VedantaBiosciencesSecuritiesCorpMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vedanta Biosciences Securities Corp. (indirectly held through Vedanta)</link:label>
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    <link:label id="lab_ptv_VedantaBiosciencesSecuritiesCorpMember_documentation_en-US" xlink:label="lab_ptv_VedantaBiosciencesSecuritiesCorpMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vedanta Biosciences Securities Corp</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_VedantaBiosciencesSecuritiesCorpMember" xlink:to="lab_ptv_VedantaBiosciencesSecuritiesCorpMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareBasedPaymentArrangementsAbstract_label_en-US" xlink:label="lab_ptv_ShareBasedPaymentArrangementsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangements [Abstract]</link:label>
    <link:label id="lab_ptv_ShareBasedPaymentArrangementsAbstract_documentation_en-US" xlink:label="lab_ptv_ShareBasedPaymentArrangementsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangements [Abstract]</link:label>
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    <link:label id="lab_ptv_DisclosureOfPayrollCostsTextBlock_60895f9e-9f2e-4e07-a81a-fef9e98842ef_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfPayrollCostsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Payroll Costs</link:label>
    <link:label id="lab_ptv_DisclosureOfPayrollCostsTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfPayrollCostsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Payroll Costs [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfPayrollCostsTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfPayrollCostsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Payroll Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfPayrollCostsTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfPayrollCostsTextBlock"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_87a6a183-8658-4df7-ac72-40e5482b90a4_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance costs, net</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForFinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:to="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FloatingInterestRateMember_827e6111-5b69-4bb6-a455-27b5b01d3971_terseLabel_en-US" xlink:label="lab_ifrs-full_FloatingInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Floating interest rate [member]</link:label>
    <link:label id="lab_ifrs-full_FloatingInterestRateMember_label_en-US" xlink:label="lab_ifrs-full_FloatingInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Floating interest rate [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FloatingInterestRateMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_FloatingInterestRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FloatingInterestRateMember" xlink:to="lab_ifrs-full_FloatingInterestRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentPrepaidExpenses_aa72339c-7927-43c2-a32a-fb5786db9849_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentPrepaidExpenses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prepaid expenses</link:label>
    <link:label id="lab_ifrs-full_CurrentPrepaidExpenses_label_en-US" xlink:label="lab_ifrs-full_CurrentPrepaidExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current prepaid expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentPrepaidExpenses" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentPrepaidExpenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentPrepaidExpenses" xlink:to="lab_ifrs-full_CurrentPrepaidExpenses" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract_e1018511-7ea8-4496-9cb3-8345cff2e3a2_terseLabel_en-US" xlink:label="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
    <link:label id="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract_label_en-US" xlink:label="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in operating assets and liabilities [Abstract]</link:label>
    <link:label id="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract_documentation_en-US" xlink:label="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in operating assets and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:href="ptv-20211231.xsd#ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract"/>
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    <link:label id="lab_ifrs-full_CashAndCashEquivalents_df0f159b-b274-4f93-9644-a20322d38b20_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_d3e03b85-f3da-41d0-8359-37d698fea8bf_periodStartLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents at beginning of year</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_f7176aab-885d-462b-a96e-9b3d278dd8e3_periodEndLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents at end of year</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalents" xlink:to="lab_ifrs-full_CashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MajorBusinessCombinationMember_cdea1b25-3a68-4763-b572-0f6582de42ba_terseLabel_en-US" xlink:label="lab_ifrs-full_MajorBusinessCombinationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major business combination [member]</link:label>
    <link:label id="lab_ifrs-full_MajorBusinessCombinationMember_label_en-US" xlink:label="lab_ifrs-full_MajorBusinessCombinationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major business combination [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorBusinessCombinationMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MajorBusinessCombinationMember"/>
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    <link:label id="lab_ptv_WeightedAverageNumberOfOrdinarySharesLineItems_2b0c8234-95e6-4bee-8b31-aa80d4a708e0_terseLabel_en-US" xlink:label="lab_ptv_WeightedAverageNumberOfOrdinarySharesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average number of ordinary shares [Line Items]</link:label>
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    <link:label id="lab_ptv_WeightedAverageNumberOfOrdinarySharesLineItems_documentation_en-US" xlink:label="lab_ptv_WeightedAverageNumberOfOrdinarySharesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average number of ordinary shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_WeightedAverageNumberOfOrdinarySharesLineItems" xlink:href="ptv-20211231.xsd#ptv_WeightedAverageNumberOfOrdinarySharesLineItems"/>
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    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems_23251714-6790-4bb8-bbe3-c1b18426f10c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems"/>
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    <link:label id="lab_ifrs-full_RetainedEarnings_fd479793-c255-4741-b062-ba1c54639c92_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retained earnings/(accumulated deficit)</link:label>
    <link:label id="lab_ifrs-full_RetainedEarnings_label_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retained earnings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RetainedEarnings"/>
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    <link:label id="lab_ptv_ReclassificationFromLevel3ToLevel1_2c306ec0-753a-4d6d-8e8e-8a744a655730_terseLabel_en-US" xlink:label="lab_ptv_ReclassificationFromLevel3ToLevel1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassification from level 3 to level 1</link:label>
    <link:label id="lab_ptv_ReclassificationFromLevel3ToLevel1_label_en-US" xlink:label="lab_ptv_ReclassificationFromLevel3ToLevel1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassification from level 3 to level 1</link:label>
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    <link:label id="lab_ptv_SummaryOfInvestmentsHeldAtFairValueTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfInvestmentsHeldAtFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary Of investments held at fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SummaryOfInvestmentsHeldAtFairValueTextBlock" xlink:href="ptv-20211231.xsd#ptv_SummaryOfInvestmentsHeldAtFairValueTextBlock"/>
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    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_9efde954-4b70-4e8a-b8ef-f1c2da83e469_netLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property and equipment, net</link:label>
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    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment</link:label>
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    <link:label id="lab_ptv_NotesPayableTable_20ee8f64-3526-4bd9-b6b0-c3164d76d302_terseLabel_en-US" xlink:label="lab_ptv_NotesPayableTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Payable [Table]</link:label>
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    <link:label id="lab_ptv_NotesPayableTable_documentation_en-US" xlink:label="lab_ptv_NotesPayableTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Payable</link:label>
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    <link:label id="lab_ifrs-full_AuditorsRemunerationForOtherServices_aa88e20b-44c9-4f90-bd9a-0d6ca42d1527_terseLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationForOtherServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-audit related services</link:label>
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    <link:label id="lab_ifrs-full_RecurringFairValueMeasurementMember_2e9bdd96-8ebe-45bd-abb6-aed1c3cfd214_terseLabel_en-US" xlink:label="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recurring fair value measurement [member]</link:label>
    <link:label id="lab_ifrs-full_RecurringFairValueMeasurementMember_label_en-US" xlink:label="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recurring fair value measurement [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
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    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_820d67b2-48cf-4aa3-8698-3f35f8530069_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average number of ordinary shareholders at December 31,</link:label>
    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_label_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average number of ordinary shares used in calculating diluted earnings per share</link:label>
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    <link:label id="lab_ptv_Other_b60c0d0e-7a05-44f1-9c12-0a7878a49159_terseLabel_en-US" xlink:label="lab_ptv_Other" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ptv_Other_label_en-US" xlink:label="lab_ptv_Other" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ptv_Other_documentation_en-US" xlink:label="lab_ptv_Other" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_Other" xlink:href="ptv-20211231.xsd#ptv_Other"/>
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    <link:label id="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance_dc75e713-a25c-4c6c-9518-8627462b6966_verboseLabel_en-US" xlink:label="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Shares Approved For Issuance</link:label>
    <link:label id="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance_label_en-US" xlink:label="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Shares Approved For Issuance</link:label>
    <link:label id="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance_documentation_en-US" xlink:label="lab_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Shares Approved For Issuance</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance" xlink:href="ptv-20211231.xsd#ptv_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesApprovedForIssuance"/>
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    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_ad6c40bc-1758-452a-8968-adfcab127064_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of intangible assets [text block]</link:label>
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    <link:label id="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock_d6e9bc2b-2f72-467a-a45d-d11955ef4981_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Weighted Average Exercise Prices for Options Forfeited</link:label>
    <link:label id="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Weighted Average Exercise Prices for Options Forfeited [Text Block]</link:label>
    <link:label id="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock_documentation_en-US" xlink:label="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Weighted Average Exercise Prices for Options Forfeited</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock" xlink:href="ptv-20211231.xsd#ptv_DisclosureOfWeightedAverageExercisePricesForOptionsForfeitedTextBlock"/>
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    <link:label id="lab_ptv_ValueAtIssuance_dc7cd6bc-290e-414a-9d99-49450a4d8d42_terseLabel_en-US" xlink:label="lab_ptv_ValueAtIssuance" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Value at Issuance</link:label>
    <link:label id="lab_ptv_ValueAtIssuance_2ce3085a-f50c-4fdf-9893-7f843cf555ac_verboseLabel_en-US" xlink:label="lab_ptv_ValueAtIssuance" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrant Issuance</link:label>
    <link:label id="lab_ptv_ValueAtIssuance_label_en-US" xlink:label="lab_ptv_ValueAtIssuance" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Value at Issuance</link:label>
    <link:label id="lab_ptv_ValueAtIssuance_documentation_en-US" xlink:label="lab_ptv_ValueAtIssuance" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Value at Issuance</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ValueAtIssuance" xlink:href="ptv-20211231.xsd#ptv_ValueAtIssuance"/>
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    <link:label id="lab_ifrs-full_CurrentFinanceLeaseReceivables_3eaa68f4-49cd-4349-93a2-89d0a5ffe253_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentFinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease receivable &#8211; short-term</link:label>
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    <link:label id="lab_ifrs-full_CurrentFinanceLeaseReceivables_label_en-US" xlink:label="lab_ifrs-full_CurrentFinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current finance lease receivables</link:label>
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    <link:label id="lab_ifrs-full_SegmentConsolidationItemsAxis_a222e97c-a9b7-4ff5-981f-34743a5baffe_terseLabel_en-US" xlink:label="lab_ifrs-full_SegmentConsolidationItemsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment consolidation items [axis]</link:label>
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    <link:label id="lab_ptv_DisclosureOfInvestmentsHeldAtFairValueTextBlock_d508f7c8-e4bc-4f6b-ae32-b7002a6ca54b_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfInvestmentsHeldAtFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value</link:label>
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    <link:label id="lab_dei_EntityAddressCityOrTown_675de41b-6569-4add-b1f1-a2480022bfe6_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_2f4f2334-d846-445b-b3d1-0a97d59c1bc1_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in Associates</link:label>
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    <link:label id="lab_ifrs-full_AllLevelsOfFairValueHierarchyMember_54bdb29e-5f5d-4925-98d7-186e35dd5c59_terseLabel_en-US" xlink:label="lab_ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">All levels of fair value hierarchy [member]</link:label>
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    <link:label id="lab_ptv_DisclosureOfInterestsInSubsidiariesTable_df19e38b-6702-4e26-8fe6-7d40abcd1bd5_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfInterestsInSubsidiariesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of interests in Subsidiaries [Table]</link:label>
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    <link:label id="lab_ifrs-full_OrdinarySharesMember_eb638d19-04cd-43a2-a45d-c367a27efea3_terseLabel_en-US" xlink:label="lab_ifrs-full_OrdinarySharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common shares [member]</link:label>
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    <link:label id="lab_ptv_OxfordFinanceLLCMember_c80daadb-1a67-480e-9238-1ff90895e834_terseLabel_en-US" xlink:label="lab_ptv_OxfordFinanceLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Oxford Finance LLC</link:label>
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    <link:label id="lab_ptv_LoansMember_ac0fede9-83f7-49bd-a2d1-495160e629fc_terseLabel_en-US" xlink:label="lab_ptv_LoansMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial liabilities [abstract]</link:label>
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    <link:label id="lab_ptv_AlivioMember_aaf0ede1-8ef1-454a-8c9e-2fecc55ed09a_verboseLabel_en-US" xlink:label="lab_ptv_AlivioMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alivio Therapeutics, Inc.</link:label>
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    <link:label id="lab_ptv_AlivioMember_documentation_en-US" xlink:label="lab_ptv_AlivioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alivio</link:label>
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    <link:label id="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsExercisedTextBlock_bf2e786c-f794-41d3-b789-bc8dafdd37bd_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfWeightedAverageExercisePricesForOptionsExercisedTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Weighted Average Exercise Prices for Options Exercised</link:label>
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    <link:label id="lab_stpr_MA_38720486-c4f2-4769-85d1-af87e0668032_terseLabel_en-US" xlink:label="lab_stpr_MA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MASSACHUSETTS</link:label>
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    <link:label id="lab_ptv_AuditorsRemunerationTable_11b5ab0d-9da7-47e3-b6a8-45036325a1c5_terseLabel_en-US" xlink:label="lab_ptv_AuditorsRemunerationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditors Remuneration [Table]</link:label>
    <link:label id="lab_ptv_AuditorsRemunerationTable_label_en-US" xlink:label="lab_ptv_AuditorsRemunerationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditors Remuneration [Table]</link:label>
    <link:label id="lab_ptv_AuditorsRemunerationTable_documentation_en-US" xlink:label="lab_ptv_AuditorsRemunerationTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditors Remuneration</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_6eb3df84-45d0-49e3-a2d6-9dcd04de854c_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income taxes, net</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for income tax expense</link:label>
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    <link:label id="lab_ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod_0e831cfb-0b6a-46e2-96b8-7285ed34049b_terseLabel_en-US" xlink:label="lab_ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in associates accounted for using equity method</link:label>
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    <link:label id="lab_ifrs-full_IssuedCapitalMember_041a215b-0b7d-439f-83c4-77990647ea95_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital [member]</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_label_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IssuedCapitalMember"/>
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    <link:label id="lab_ifrs-full_CurrentTaxAssetsCurrent_3bfe301a-b86f-4763-8506-49bcf6e38085_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxAssetsCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income tax receivable</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxAssetsCurrent_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxAssetsCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current tax assets, current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxAssetsCurrent" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentTaxAssetsCurrent"/>
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    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_2ef2b8ac-aaf7-48eb-9349-c9491b88df4a_terseLabel_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [member]</link:label>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_label_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember"/>
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    <link:label id="lab_ptv_FinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate_25cb4566-abe8-4f8c-a914-cb398f20e8d1_terseLabel_en-US" xlink:label="lab_ptv_FinanceIncomeCostsFairValueAccountingReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income/(costs) &#8211; fair value accounting</link:label>
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    <link:label id="lab_ifrs-full_ProfitLoss_f30aceb0-ac4c-40b7-8b37-658d9d68ed84_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income/(Loss) for the year</link:label>
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    <link:label id="lab_ifrs-full_ProfitLoss_label_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss)</link:label>
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    <link:label id="lab_ptv_KnodeMember_65a3e94e-231f-4390-859e-a3bafc91d424_verboseLabel_en-US" xlink:label="lab_ptv_KnodeMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Knode Inc. (indirectly held through Enlight)</link:label>
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    <link:label id="lab_dei_EntityFilerCategory_dc3baf7f-da66-4ee9-a5ec-f773cd03b5df_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Filer Category</link:label>
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    <link:label id="lab_ptv_AkiliMember_e5d92ebf-5442-4185-8ffc-5b212c2d1a0b_terseLabel_en-US" xlink:label="lab_ptv_AkiliMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Akili [Member]</link:label>
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    <link:label id="lab_ptv_AkiliMember_documentation_en-US" xlink:label="lab_ptv_AkiliMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Akili</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AkiliMember" xlink:href="ptv-20211231.xsd#ptv_AkiliMember"/>
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    <link:label id="lab_ptv_AccountingPoliciesAbstract_9c7206c9-0487-495a-83e2-7a4fbe5948bb_terseLabel_en-US" xlink:label="lab_ptv_AccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting policies, changes in accounting estimates and errors [Abstract]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesAbstract_label_en-US" xlink:label="lab_ptv_AccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:label id="lab_ptv_AccountingPoliciesAbstract_documentation_en-US" xlink:label="lab_ptv_AccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting Policies</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_5a85412c-965a-4249-9d2c-43163abee5b9_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Liabilities</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for financial liabilities [text block]</link:label>
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    <link:label id="lab_ptv_DrJosephBolenMember_11527b7a-5191-43c7-98f3-b39a1f1a71e0_terseLabel_en-US" xlink:label="lab_ptv_DrJosephBolenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr Joseph Bolen</link:label>
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    <link:label id="lab_ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember_35e7fbf4-2f1f-4451-bc85-5a4dc37cce53_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Three to Twelve months</link:label>
    <link:label id="lab_ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Later than three months and not later than one year [member]</link:label>
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    <link:label id="lab_ptv_ExercisePriceRangeFourMember_09a00dad-fb09-49e5-ad73-7cc246860673_terseLabel_en-US" xlink:label="lab_ptv_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">3.00 to 4.00</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeFourMember_label_en-US" xlink:label="lab_ptv_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
    <link:label id="lab_ptv_ExercisePriceRangeFourMember_documentation_en-US" xlink:label="lab_ptv_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
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    <link:label id="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability_82c50d05-861a-4700-bdc0-85abd87f6f60_terseLabel_en-US" xlink:label="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of intangible asset and investment held at fair value in consideration for issuance of warrant liability and assumption of other long and short-term liabilities</link:label>
    <link:label id="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability_label_en-US" xlink:label="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">purchase of intangible asset and investment in consideration for issuance of warrant and other liability</link:label>
    <link:label id="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability_documentation_en-US" xlink:label="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">purchase of intangible asset and investment in consideration for issuance of warrant and other liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:href="ptv-20211231.xsd#ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:to="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory_ac5a5f76-b75d-4210-9a4a-dab366a64526_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of quantitative information about right-of-use assets</link:label>
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    <link:label id="lab_ifrs-full_SharebasedPaymentArrangementsMember_d2b1827c-92b6-4163-bd46-8e1b7d1d7318_terseLabel_en-US" xlink:label="lab_ifrs-full_SharebasedPaymentArrangementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payment arrangements [member]</link:label>
    <link:label id="lab_ifrs-full_SharebasedPaymentArrangementsMember_label_en-US" xlink:label="lab_ifrs-full_SharebasedPaymentArrangementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payment arrangements [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_SharebasedPaymentArrangementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember" xlink:to="lab_ifrs-full_SharebasedPaymentArrangementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment_58d2428e-bcbf-4d3c-b2f2-1252eaff6026_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Additional Investment</link:label>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment_label_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Additional Investment</link:label>
    <link:label id="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment_documentation_en-US" xlink:label="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Investment In Common Share, Additional Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:href="ptv-20211231.xsd#ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:to="lab_ptv_BusinessCombinationInvestmentInCommonShareAdditionalInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_315f13de-7f8b-4b8e-b08f-1b2365a8cafa_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_label_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ReceiptOfPaymentOfSublease_c033d701-4e74-4353-a3f2-8c1fa53467be_terseLabel_en-US" xlink:label="lab_ptv_ReceiptOfPaymentOfSublease" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receipt of payment of sublease</link:label>
    <link:label id="lab_ptv_ReceiptOfPaymentOfSublease_label_en-US" xlink:label="lab_ptv_ReceiptOfPaymentOfSublease" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receipt of payment of sublease</link:label>
    <link:label id="lab_ptv_ReceiptOfPaymentOfSublease_documentation_en-US" xlink:label="lab_ptv_ReceiptOfPaymentOfSublease" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receipt of payment of sublease</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ReceiptOfPaymentOfSublease" xlink:href="ptv-20211231.xsd#ptv_ReceiptOfPaymentOfSublease"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ReceiptOfPaymentOfSublease" xlink:to="lab_ptv_ReceiptOfPaymentOfSublease" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements_2bbac40b-53f5-4b93-80ab-53666c366cb0_terseLabel_en-US" xlink:label="lab_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basis of Measurement</link:label>
    <link:label id="lab_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements_label_en-US" xlink:label="lab_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Explanation of measurement bases used in preparing financial statements [text block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements" xlink:to="lab_ifrs-full_ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_aae775b6-ea31-44c7-bec0-a9fb4ea597ed_verboseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price, options granted (GBP)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_41b98b18-0269-4ab5-b0c2-9b551b5b365e_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options granted in share-based payment arrangement</link:label>
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    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInAssociate_a7863028-8b45-4140-8d9b-58a4f4161869_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in associate</link:label>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInAssociate_label_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in associate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProportionOfOwnershipInterestInAssociate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:to="lab_ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest_0753f97f-8f68-4bea-b9e8-ea64ed139248_terseLabel_en-US" xlink:label="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of associate loss allocated to long-term interest</link:label>
    <link:label id="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest_label_en-US" xlink:label="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of associate loss allocated to long-term interest</link:label>
    <link:label id="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest_documentation_en-US" xlink:label="lab_ptv_ShareOfAssociateLossAllocatedToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share of associate loss allocated to long-term interest</link:label>
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    <link:label id="lab_ptv_AccruedInterestConvertibleNotes_07371fee-8f25-46f2-9a02-f4b1fe122872_terseLabel_en-US" xlink:label="lab_ptv_AccruedInterestConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest, Convertible Notes</link:label>
    <link:label id="lab_ptv_AccruedInterestConvertibleNotes_label_en-US" xlink:label="lab_ptv_AccruedInterestConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest, Convertible Notes</link:label>
    <link:label id="lab_ptv_AccruedInterestConvertibleNotes_documentation_en-US" xlink:label="lab_ptv_AccruedInterestConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest, Convertible Notes</link:label>
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    <link:label id="lab_ifrs-full_DepreciationRightofuseAssets_46e5223b-9166-40b9-9faf-f0d76ef12739_verboseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization of ROU assets</link:label>
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    <link:label id="lab_ifrs-full_DepreciationRightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_DepreciationRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depreciation, right-of-use assets</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_41e8015e-842d-4c7c-8212-c4336a4903ca_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of financial instruments [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_bec395ba-a741-477c-a7e9-582c1ad61d13_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and Other Payables</link:label>
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    <link:label id="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest_e02484e4-e445-4beb-9135-e4f429820ce5_terseLabel_en-US" xlink:label="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance at end of period after allocation of associate loss to long-term interest</link:label>
    <link:label id="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest_label_en-US" xlink:label="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets At Fair Value Through Profit Or Loss after allocation to long-term interest</link:label>
    <link:label id="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest_documentation_en-US" xlink:label="lab_ptv_FinancialAssetsAtFairValueThroughProfitOrLossAfterAllocationToLongTermInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets At Fair Value Through Profit Or Loss after allocation to long-term interest</link:label>
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    <link:label id="lab_ptv_OwnershipInterest_4cef86f6-5860-412b-8af4-df0884ca2e2a_terseLabel_en-US" xlink:label="lab_ptv_OwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ownership Interest</link:label>
    <link:label id="lab_ptv_OwnershipInterest_label_en-US" xlink:label="lab_ptv_OwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ownership Interest</link:label>
    <link:label id="lab_ptv_OwnershipInterest_documentation_en-US" xlink:label="lab_ptv_OwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ownership Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_OwnershipInterest" xlink:href="ptv-20211231.xsd#ptv_OwnershipInterest"/>
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    <link:label id="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_5e534d99-e592-489c-94ef-ae94d9b797a3_terseLabel_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-adjusting events after reporting period [axis]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
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    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable_d3990ea2-9cb5-4910-88fe-37bb6fa36169_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company [Table]</link:label>
    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable_label_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company [Table]</link:label>
    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable_documentation_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EarningsLossAttributableToOwnersOfTheCompanyTable" xlink:href="ptv-20211231.xsd#ptv_EarningsLossAttributableToOwnersOfTheCompanyTable"/>
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    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_4642c022-1e4e-4ef4-bd2b-d885319c90a6_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total current income tax expense/(benefit)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CurrentTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:to="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IssuanceOfNoteReceivable_078058a1-8da0-4f38-867d-8b7813bb7e0c_terseLabel_en-US" xlink:label="lab_ptv_IssuanceOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of note receivable</link:label>
    <link:label id="lab_ptv_IssuanceOfNoteReceivable_label_en-US" xlink:label="lab_ptv_IssuanceOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of note receivable</link:label>
    <link:label id="lab_ptv_IssuanceOfNoteReceivable_documentation_en-US" xlink:label="lab_ptv_IssuanceOfNoteReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of note receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IssuanceOfNoteReceivable" xlink:href="ptv-20211231.xsd#ptv_IssuanceOfNoteReceivable"/>
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    <link:label id="lab_ifrs-full_AuditorsRemuneration_e8376851-b8e3-4993-87fc-6ea7a5e83e7e_totalLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemuneration" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total</link:label>
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    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_ec4847d7-55a5-4b7b-9e56-90694d525ec2_terseLabel_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [member]</link:label>
    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_label_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember"/>
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    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_cb847f2d-d577-46c5-ad00-57f1b9461e0a_terseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-controlling interests</link:label>
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    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesAbstract_aca1a46b-bba9-46dc-95f3-7e66948f54dd_terseLabel_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Abstract]</link:label>
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    <link:label id="lab_ptv_RelatedPartyTransactionsLineItems_afd781ef-3a28-40db-a26c-87d688a38257_terseLabel_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions [Line Items]</link:label>
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    <link:label id="lab_ptv_RelatedPartyTransactionsLineItems_documentation_en-US" xlink:label="lab_ptv_RelatedPartyTransactionsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions</link:label>
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    <link:label id="lab_ifrs-full_PreferenceSharesMember_265d66ae-f991-4993-9626-251cc7b66537_terseLabel_en-US" xlink:label="lab_ifrs-full_PreferenceSharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preference shares [member]</link:label>
    <link:label id="lab_ifrs-full_PreferenceSharesMember_label_en-US" xlink:label="lab_ifrs-full_PreferenceSharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preference shares [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PreferenceSharesMember" xlink:to="lab_ifrs-full_PreferenceSharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_0815227b-8dcd-4014-97ca-af428b10f1c4_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance Share Capital (in shares)</link:label>
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    <link:label id="lab_ifrs-full_NumberOfSharesIssued_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued</link:label>
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    <link:label id="lab_ptv_ProceedsFromIssueOfConvertibleNotes_9c2b7cf2-b6f3-443d-b249-71d6e810ee03_terseLabel_en-US" xlink:label="lab_ptv_ProceedsFromIssueOfConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issue of convertible notes</link:label>
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    <link:label id="lab_ptv_ProceedsFromIssueOfConvertibleNotes_documentation_en-US" xlink:label="lab_ptv_ProceedsFromIssueOfConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issue of convertible notes</link:label>
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    <link:label id="lab_ptv_GainOnDeconsolidationTable_eb9dcab5-c0ed-4a76-b823-8ddeffc55071_terseLabel_en-US" xlink:label="lab_ptv_GainOnDeconsolidationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation [Table]</link:label>
    <link:label id="lab_ptv_GainOnDeconsolidationTable_label_en-US" xlink:label="lab_ptv_GainOnDeconsolidationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation [Table]</link:label>
    <link:label id="lab_ptv_GainOnDeconsolidationTable_documentation_en-US" xlink:label="lab_ptv_GainOnDeconsolidationTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation</link:label>
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    <link:label id="lab_ptv_MsDapneZoharMember_ac66ea4d-df17-431e-b8cd-da5426742e2c_terseLabel_en-US" xlink:label="lab_ptv_MsDapneZoharMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ms Dapne Zohar</link:label>
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    <link:label id="lab_ptv_DeferredTaxAssetsAndLiabilitiesTable_0219db0c-3e3f-48b3-9a6c-f4d415012192_terseLabel_en-US" xlink:label="lab_ptv_DeferredTaxAssetsAndLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Tax Assets and Liabilities [Table]</link:label>
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    <link:label id="lab_ptv_DeferredTaxAssetsAndLiabilitiesTable_documentation_en-US" xlink:label="lab_ptv_DeferredTaxAssetsAndLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Tax Assets and Liabilities [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DeferredTaxAssetsAndLiabilitiesTable" xlink:href="ptv-20211231.xsd#ptv_DeferredTaxAssetsAndLiabilitiesTable"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_706725df-dbd7-4de8-a677-a194ac8aa438_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Realized loss on sale of investments</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable_4d6c7799-12af-478f-b86c-2bcb0dccf4a6_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Maturity Analysis of Operating Lease Payments [Table]</link:label>
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    <link:label id="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_2fd86744-0e08-4db0-b175-6e75436a40ce_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest received</link:label>
    <link:label id="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest received, classified as operating activities</link:label>
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    <link:label id="lab_ptv_DrJohnLaMattinaMember_363d3786-be5d-41a6-96e0-b7148ae8d00a_terseLabel_en-US" xlink:label="lab_ptv_DrJohnLaMattinaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dr John LaMattina</link:label>
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    <link:label id="lab_ptv_BusinessCombinationAvailableFundsThreshold_2dedbc00-62ac-44e7-a463-eecde9cee02f_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationAvailableFundsThreshold" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, available funds threshold</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentLiabilities_93fc939e-ebc8-401a-b6a6-728db0c5487c_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total non-current liabilities</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory_3dc3f3f9-fd97-44f5-b3ef-1db5e53580a6_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Parties Transactions</link:label>
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    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_9c2e3d88-826f-4f8f-9bf9-9ac640821890_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">One year to Five Years</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_8c5c02b9-dbf7-468e-b3da-a63a6ceec5bf_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Measurements</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for fair value measurement [text block]</link:label>
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    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_e3722167-8d4b-4dbd-9bc7-01218a087697_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interests held by non-controlling interests</link:label>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_label_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interests held by non-controlling interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests"/>
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    <link:label id="lab_ifrs-full_PerformanceObligationsMember_14a01104-751a-4994-8a95-7f9da08bd5d5_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance obligations [member]</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsMember_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance obligations [member]</link:label>
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    <link:label id="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue_0e3af713-e4af-4329-9d8c-3d0de46d6ffb_terseLabel_en-US" xlink:label="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Excess of fair value at reclassification date over grant date fair value</link:label>
    <link:label id="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue_label_en-US" xlink:label="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Excess of fair value at reclassification date over grant date fair value</link:label>
    <link:label id="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue_documentation_en-US" xlink:label="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Excess of fair value at reclassification date over grant date fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:href="ptv-20211231.xsd#ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:to="lab_ptv_ExcessOfFairValueAtReclassificationDateOverGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesToRelatedParties_9fd536f0-de19-41f6-8243-19d27eebef3f_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToRelatedParties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payables to related parties</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesToRelatedParties_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToRelatedParties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payables to related parties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherPayablesToRelatedParties" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TradeAndOtherPayablesToRelatedParties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherPayablesToRelatedParties" xlink:to="lab_ifrs-full_TradeAndOtherPayablesToRelatedParties" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_96b1db7f-4d5a-47eb-89bb-bde4117aaf4f_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases of intangible assets</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of intangible assets, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RelatedPartyTransactionsAbstract_d0bffe00-1a86-44c9-802d-7c4ab7434903_terseLabel_en-US" xlink:label="lab_ifrs-full_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions [abstract]</link:label>
    <link:label id="lab_ifrs-full_RelatedPartyTransactionsAbstract_label_en-US" xlink:label="lab_ifrs-full_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RelatedPartyTransactionsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RelatedPartyTransactionsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RelatedPartyTransactionsAbstract" xlink:to="lab_ifrs-full_RelatedPartyTransactionsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryEnterpriseValueMember_d1ecf0be-c27e-4e72-9e52-2cd2a2f38573_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryEnterpriseValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Enterprise Value</link:label>
    <link:label id="lab_ptv_SubsidiaryEnterpriseValueMember_20a56cc3-0e3a-4dd3-adca-4d927fe26eee_verboseLabel_en-US" xlink:label="lab_ptv_SubsidiaryEnterpriseValueMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investee Enterprise Value</link:label>
    <link:label id="lab_ptv_SubsidiaryEnterpriseValueMember_label_en-US" xlink:label="lab_ptv_SubsidiaryEnterpriseValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Enterprise Value [Member]</link:label>
    <link:label id="lab_ptv_SubsidiaryEnterpriseValueMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryEnterpriseValueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Enterprise Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryEnterpriseValueMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryEnterpriseValueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryEnterpriseValueMember" xlink:to="lab_ptv_SubsidiaryEnterpriseValueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_034fc9a5-7b42-4200-8738-ffbeaa47c2cd_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment Information</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of entity's operating segments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeAbstract_34581518-487c-431c-acb0-2ef47187c18e_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other comprehensive income/(loss):</link:label>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeAbstract_label_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other comprehensive income [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_OtherComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_RSUTable_ec181994-ec76-4472-a215-d0689257d26f_terseLabel_en-US" xlink:label="lab_ptv_RSUTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU [Table]</link:label>
    <link:label id="lab_ptv_RSUTable_label_en-US" xlink:label="lab_ptv_RSUTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU [Table]</link:label>
    <link:label id="lab_ptv_RSUTable_documentation_en-US" xlink:label="lab_ptv_RSUTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RSU</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RSUTable" xlink:href="ptv-20211231.xsd#ptv_RSUTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_RSUTable" xlink:to="lab_ptv_RSUTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FederalMember_0c69b41c-7ca3-46d0-8264-36b8fbfd8aa0_terseLabel_en-US" xlink:label="lab_ptv_FederalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal [Member]</link:label>
    <link:label id="lab_ptv_FederalMember_label_en-US" xlink:label="lab_ptv_FederalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal [Member]</link:label>
    <link:label id="lab_ptv_FederalMember_documentation_en-US" xlink:label="lab_ptv_FederalMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FederalMember" xlink:href="ptv-20211231.xsd#ptv_FederalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FederalMember" xlink:to="lab_ptv_FederalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentAnnualReport_4f179957-1549-4644-b755-7533ca9c9931_terseLabel_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Annual Report</link:label>
    <link:label id="lab_dei_DocumentAnnualReport_label_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Annual Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentAnnualReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAnnualReport" xlink:to="lab_dei_DocumentAnnualReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost_efc7c86d-7d9b-4d2e-a0f9-b972bb4c1f53_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, number of additional shares received at no additional cost</link:label>
    <link:label id="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost_label_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Number Of Additional Shares Received At No Additional Cost</link:label>
    <link:label id="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost_documentation_en-US" xlink:label="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Number Of Additional Shares Received At No Additional Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:href="ptv-20211231.xsd#ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:to="lab_ptv_BusinessCombinationNumberOfAdditionalSharesReceivedAtNoAdditionalCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProportionOfOwnershipInterestInInvestee_2c7db7b4-fa6a-41be-bc20-ce9e2c823217_terseLabel_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInInvestee" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in investee</link:label>
    <link:label id="lab_ptv_ProportionOfOwnershipInterestInInvestee_label_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInInvestee" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in investee</link:label>
    <link:label id="lab_ptv_ProportionOfOwnershipInterestInInvestee_documentation_en-US" xlink:label="lab_ptv_ProportionOfOwnershipInterestInInvestee" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proportion of ownership interest in investee</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProportionOfOwnershipInterestInInvestee" xlink:href="ptv-20211231.xsd#ptv_ProportionOfOwnershipInterestInInvestee"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProportionOfOwnershipInterestInInvestee" xlink:to="lab_ptv_ProportionOfOwnershipInterestInInvestee" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_InterestOnUndiscountedLeasePayments_729f0baf-2af9-494d-bf1b-c5690584c7e0_terseLabel_en-US" xlink:label="lab_ptv_InterestOnUndiscountedLeasePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_ptv_InterestOnUndiscountedLeasePayments_label_en-US" xlink:label="lab_ptv_InterestOnUndiscountedLeasePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest On Undiscounted Lease payments</link:label>
    <link:label id="lab_ptv_InterestOnUndiscountedLeasePayments_documentation_en-US" xlink:label="lab_ptv_InterestOnUndiscountedLeasePayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest On Undiscounted Lease payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_InterestOnUndiscountedLeasePayments" xlink:href="ptv-20211231.xsd#ptv_InterestOnUndiscountedLeasePayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_InterestOnUndiscountedLeasePayments" xlink:to="lab_ptv_InterestOnUndiscountedLeasePayments" xlink:type="arc" order="1"/>
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    <link:label id="lab_ptv_IncreaseDecreaseThroughNCIExerciseOfShareBasedAwardsInSubsidiaries_documentation_en-US" xlink:label="lab_ptv_IncreaseDecreaseThroughNCIExerciseOfShareBasedAwardsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease Through NCI exercise of share-based awards in Subsidiaries</link:label>
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    <link:label id="lab_ptv_ContributedByTypesAxis_1a247cb6-5ad0-4c80-9ce8-badac6d07b81_terseLabel_en-US" xlink:label="lab_ptv_ContributedByTypesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contributed By - Types [Axis]</link:label>
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    <link:label id="lab_ptv_ConvertibleDebtInstrumentsConvertedToEquity_d52328c2-4a7c-440a-94a5-8a2eb8febb94_terseLabel_en-US" xlink:label="lab_ptv_ConvertibleDebtInstrumentsConvertedToEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible debt, instruments, converted to equity</link:label>
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    <link:label id="lab_ptv_RateOfTransactionCostsReconciliationOfEffectiveTaxRate_6e479860-6108-42b8-b5f5-0ec141ce9f36_terseLabel_en-US" xlink:label="lab_ptv_RateOfTransactionCostsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transaction Costs</link:label>
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    <link:label id="lab_ptv_RateOfTransactionCostsReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfTransactionCostsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of transaction costs, reconciliation of effective tax rate</link:label>
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    <link:label id="lab_ifrs-full_OtherCurrentPayables_3a0da968-e9c6-425f-a33e-02f27beb82d1_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentPayables_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current payables</link:label>
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    <link:label id="lab_ifrs-full_SegmentsMember_5f52a08c-48a0-46f5-a063-6cd10a243965_terseLabel_en-US" xlink:label="lab_ifrs-full_SegmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_SegmentsMember"/>
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    <link:label id="lab_ptv_InvestmentUponInitialPublicOffering_7a192940-649a-4f54-8714-1ffa55d2979d_terseLabel_en-US" xlink:label="lab_ptv_InvestmentUponInitialPublicOffering" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment upon initial public offering</link:label>
    <link:label id="lab_ptv_InvestmentUponInitialPublicOffering_label_en-US" xlink:label="lab_ptv_InvestmentUponInitialPublicOffering" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment upon initial public offering</link:label>
    <link:label id="lab_ptv_InvestmentUponInitialPublicOffering_documentation_en-US" xlink:label="lab_ptv_InvestmentUponInitialPublicOffering" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment upon initial public offering</link:label>
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    <link:label id="lab_ptv_ParentCompanyAndOtherMember_bba394d3-a907-42cd-b060-a5a8b37db516_terseLabel_en-US" xlink:label="lab_ptv_ParentCompanyAndOtherMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Parent Company And Other</link:label>
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    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_719f1599-b866-4c2f-aec3-e64deaed6506_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forfeited (in shares)</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfShareCapitalAxis_2df3e0ba-f131-4a11-8f83-b66f31fd1287_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of share capital [axis]</link:label>
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    <link:label id="lab_ptv_TaxationAbstract_692fe9a9-2316-4d76-af79-bd9a7e1ed8fb_terseLabel_en-US" xlink:label="lab_ptv_TaxationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation [Abstract]</link:label>
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    <link:label id="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase_39ff9f65-8580-43ec-a0bc-bff921b2d01b_terseLabel_en-US" xlink:label="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional number of shares authorized to purchase</link:label>
    <link:label id="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase_label_en-US" xlink:label="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional number of shares authorized to purchase</link:label>
    <link:label id="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase_documentation_en-US" xlink:label="lab_ptv_AdditionalNumberOfSharesAuthorizedToPurchase" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional number of shares authorized to purchase</link:label>
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    <link:label id="lab_ifrs-full_CorporateLoansMember_86be3c11-71b6-461c-9813-b5f62327d7b8_terseLabel_en-US" xlink:label="lab_ifrs-full_CorporateLoansMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Money Markets [member]</link:label>
    <link:label id="lab_ifrs-full_CorporateLoansMember_label_en-US" xlink:label="lab_ifrs-full_CorporateLoansMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans to corporate entities [member]</link:label>
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    <link:label id="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostTransactionPrice_778b9136-25fe-4c55-b009-43fc0b6d4463_terseLabel_en-US" xlink:label="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostTransactionPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combination, additional shares to be received at no additional cost, transaction cost</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostTransactionPrice" xlink:to="lab_ptv_BusinessCombinationAdditionalSharesToBeReceivedAtNoAdditionalCostTransactionPrice" xlink:type="arc" order="1"/>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract"/>
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    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets_label_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of reasonably possible decrease in unobservable input, assets</link:label>
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    <link:label id="lab_ptv_AuditRelatedAssuranceServices_ad8a588c-1fa9-467d-8b22-12d71e019f77_terseLabel_en-US" xlink:label="lab_ptv_AuditRelatedAssuranceServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit related assurance services</link:label>
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    <link:label id="lab_ptv_AuditRelatedAssuranceServices_documentation_en-US" xlink:label="lab_ptv_AuditRelatedAssuranceServices" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Audit related assurance services</link:label>
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    <link:label id="lab_ptv_SubsidiaryWarrantLiabilityMember_a2d69f8d-f50a-4d58-a5c5-addda7583db1_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryWarrantLiabilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary warrant liability</link:label>
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    <link:label id="lab_ptv_SubsidiaryWarrantLiabilityMember_documentation_en-US" xlink:label="lab_ptv_SubsidiaryWarrantLiabilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary warrant liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryWarrantLiabilityMember" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryWarrantLiabilityMember"/>
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    <link:label id="lab_ptv_NumberOfSharesIssuableBasedOnServiceConditions_label_en-US" xlink:label="lab_ptv_NumberOfSharesIssuableBasedOnServiceConditions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issuable based on service conditions</link:label>
    <link:label id="lab_ptv_NumberOfSharesIssuableBasedOnServiceConditions_documentation_en-US" xlink:label="lab_ptv_NumberOfSharesIssuableBasedOnServiceConditions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issuable based on service conditions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfSharesIssuableBasedOnServiceConditions" xlink:href="ptv-20211231.xsd#ptv_NumberOfSharesIssuableBasedOnServiceConditions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NumberOfSharesIssuableBasedOnServiceConditions" xlink:to="lab_ptv_NumberOfSharesIssuableBasedOnServiceConditions" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate_722dd29a-cfbe-40a0-a268-3f18e697b206_terseLabel_en-US" xlink:label="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recognition of deferred tax assets and tax benefits not previously recognized</link:label>
    <link:label id="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets and benefits not previously recognised, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax assets and benefits not previously recognised, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:to="lab_ptv_DeferredTaxAssetsAndBenefitsNotPreviouslyRecognisedReconciliationOfEffectiveTaxRate" xlink:type="arc" order="1"/>
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    <link:label id="lab_ptv_ExercisePrice_label_en-US" xlink:label="lab_ptv_ExercisePrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price</link:label>
    <link:label id="lab_ptv_ExercisePrice_documentation_en-US" xlink:label="lab_ptv_ExercisePrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ExercisePrice" xlink:href="ptv-20211231.xsd#ptv_ExercisePrice"/>
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    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn_4c437ec6-c1e8-4891-b55f-7ce8f9a73f51_terseLabel_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries in the Group consolidated state tax return</link:label>
    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn_label_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries in the Group consolidated state tax return</link:label>
    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn_documentation_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries in the Group consolidated state tax return</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:href="ptv-20211231.xsd#ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:to="lab_ptv_PercentageVoteAndValueOfSubsidiariesInTheGroupConsolidatedStateTaxReturn" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_e3d8d817-0247-4440-ac71-a248ae3b56d5_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade payables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current trade payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers"/>
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    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems_bbaf05c9-14a7-47e8-bde8-65bcd0d4d452_terseLabel_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company [Line Items]</link:label>
    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems_label_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company [Line Items]</link:label>
    <link:label id="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems_documentation_en-US" xlink:label="lab_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(Loss) attributable to owners of the Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems" xlink:href="ptv-20211231.xsd#ptv_EarningsLossAttributableToOwnersOfTheCompanyLineItems"/>
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    <link:label id="lab_ptv_ShortTermNoteTable_1d4ce68f-30bf-4a98-8b9d-47a87ce0b559_terseLabel_en-US" xlink:label="lab_ptv_ShortTermNoteTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Table]</link:label>
    <link:label id="lab_ptv_ShortTermNoteTable_label_en-US" xlink:label="lab_ptv_ShortTermNoteTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Table]</link:label>
    <link:label id="lab_ptv_ShortTermNoteTable_documentation_en-US" xlink:label="lab_ptv_ShortTermNoteTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note [Table]</link:label>
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    <link:label id="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits_6eb8cd61-8b10-4f91-94f1-aa22b66bd782_terseLabel_en-US" xlink:label="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Settlement of restricted stock units</link:label>
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    <link:label id="lab_ptv_NumberOfSharesIssuedByInvestee_e1d6e086-ae61-4458-aec7-74204ca732dc_terseLabel_en-US" xlink:label="lab_ptv_NumberOfSharesIssuedByInvestee" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued by investee</link:label>
    <link:label id="lab_ptv_NumberOfSharesIssuedByInvestee_label_en-US" xlink:label="lab_ptv_NumberOfSharesIssuedByInvestee" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued by investee</link:label>
    <link:label id="lab_ptv_NumberOfSharesIssuedByInvestee_documentation_en-US" xlink:label="lab_ptv_NumberOfSharesIssuedByInvestee" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued by investee</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfSharesIssuedByInvestee" xlink:href="ptv-20211231.xsd#ptv_NumberOfSharesIssuedByInvestee"/>
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    <link:label id="lab_ifrs-full_ProceedsFromIssueOfPreferenceShares_e1545f82-0160-4511-876d-2059f05134ea_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssueOfPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of subsidiary preferred Shares</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromIssueOfPreferenceShares_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssueOfPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issue of preference shares</link:label>
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    <link:label id="lab_ptv_InvestmentsHeldAtFairValueAbstract_label_en-US" xlink:label="lab_ptv_InvestmentsHeldAtFairValueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held at fair value [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_ComprehensiveIncome_6d9e8884-db4d-4080-9dfe-37d75c306e01_totalLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total comprehensive income/(loss) for the year</link:label>
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    <link:label id="lab_ptv_TalMember_33127b7d-3670-45e5-84bc-718f033b6660_verboseLabel_en-US" xlink:label="lab_ptv_TalMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tal Medical, Inc.</link:label>
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    <link:label id="lab_ptv_InternalMember_1d1dcddb-3d40-41d8-852d-94500a9eacb9_terseLabel_en-US" xlink:label="lab_ptv_InternalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Internal</link:label>
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    <link:label id="lab_ptv_InternalMember_documentation_en-US" xlink:label="lab_ptv_InternalMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Internal</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory_4ad40115-58f6-4420-a76d-c0cf104f920f_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Benefits</link:label>
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    <link:label id="lab_ptv_TotalSubsidiaryTypesMember_a21fb876-0774-41a1-b322-483713977645_terseLabel_en-US" xlink:label="lab_ptv_TotalSubsidiaryTypesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Subsidiary Types [Member]</link:label>
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    <link:label id="lab_ptv_TotalSubsidiaryTypesMember_documentation_en-US" xlink:label="lab_ptv_TotalSubsidiaryTypesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Subsidiary Types</link:label>
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    <link:label id="lab_ptv_EstimatedTimeToExitMeasurementInputMember_a966dbbe-037b-44e1-85d1-8dd73ed6fc9e_terseLabel_en-US" xlink:label="lab_ptv_EstimatedTimeToExitMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated time to exit</link:label>
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    <link:label id="lab_ptv_EstimatedTimeToExitMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_EstimatedTimeToExitMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated time to exit, measurement input</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable_f6448930-0f2f-4b67-a5e3-19b8ef389a37_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of liabilities [table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable"/>
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    <link:label id="lab_ifrs-full_OtherFinancialAssets_668b5dd0-0415-4137-a2cb-6f13fc5e630b_totalLabel_en-US" xlink:label="lab_ifrs-full_OtherFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total other financial assets</link:label>
    <link:label id="lab_ifrs-full_OtherFinancialAssets_label_en-US" xlink:label="lab_ifrs-full_OtherFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other financial assets</link:label>
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    <link:label id="lab_ptv_DisaggregationOfRevenueCustomersOver10OfRevenueTable_86241a60-4995-4aac-961d-37d97e4ca7c1_terseLabel_en-US" xlink:label="lab_ptv_DisaggregationOfRevenueCustomersOver10OfRevenueTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disaggregation of Revenue - Customers over 10% of revenue [Table]</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentFinanceLeaseReceivables_00dc92c5-1f4e-4aa0-8a38-c5dcde7c2d8d_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentFinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease receivable &#8211; long-term</link:label>
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    <link:label id="lab_ifrs-full_RevenueFromContractsWithCustomers_e61df64f-ee3a-4ffd-b691-fdc7758ea7a3_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueFromContractsWithCustomers" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract revenue</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueFromContractsWithCustomers" xlink:to="lab_ifrs-full_RevenueFromContractsWithCustomers" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GeneralAndAdministrativeExpense_41500155-8907-4ddb-a9dd-1337f02b47ba_terseLabel_en-US" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General and administrative expenses</link:label>
    <link:label id="lab_ifrs-full_GeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General and administrative expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeneralAndAdministrativeExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GeneralAndAdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeneralAndAdministrativeExpense" xlink:to="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_85f3ddaf-4f4b-4462-ad88-d282f4e0dc44_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
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    <link:label id="lab_ifrs-full_Level1OfFairValueHierarchyMember_6c1a843b-52e1-41b6-ad47-38fbe6b7b5fb_terseLabel_en-US" xlink:label="lab_ifrs-full_Level1OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 1 of fair value hierarchy [member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level1OfFairValueHierarchyMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_Level1OfFairValueHierarchyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Level1OfFairValueHierarchyMember" xlink:to="lab_ifrs-full_Level1OfFairValueHierarchyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SondeMember_0d2108c3-b7d7-483c-87dd-9451f8f9dba7_verboseLabel_en-US" xlink:label="lab_ptv_SondeMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sonde Health, Inc.</link:label>
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    <link:label id="lab_ptv_SondeMember_label_en-US" xlink:label="lab_ptv_SondeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sonde [Member]</link:label>
    <link:label id="lab_ptv_SondeMember_documentation_en-US" xlink:label="lab_ptv_SondeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sonde</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SondeMember" xlink:href="ptv-20211231.xsd#ptv_SondeMember"/>
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    <link:label id="lab_ptv_LeaseLiabilitiesTable_2e7528e4-ee72-4215-8a71-cc9814ed3b4f_terseLabel_en-US" xlink:label="lab_ptv_LeaseLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease Liabilities [Table]</link:label>
    <link:label id="lab_ptv_LeaseLiabilitiesTable_label_en-US" xlink:label="lab_ptv_LeaseLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease Liabilities [Table]</link:label>
    <link:label id="lab_ptv_LeaseLiabilitiesTable_documentation_en-US" xlink:label="lab_ptv_LeaseLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease Liabilities [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LeaseLiabilitiesTable" xlink:href="ptv-20211231.xsd#ptv_LeaseLiabilitiesTable"/>
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    <link:label id="lab_ptv_EndraHoldingsLLCMember_9671c14f-304e-48fb-96ea-c8d9d2609a8b_verboseLabel_en-US" xlink:label="lab_ptv_EndraHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Endra Holdings, LLC (held indirectly through Enlight)</link:label>
    <link:label id="lab_ptv_EndraHoldingsLLCMember_label_en-US" xlink:label="lab_ptv_EndraHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Endra Holdings LLC [Member]</link:label>
    <link:label id="lab_ptv_EndraHoldingsLLCMember_documentation_en-US" xlink:label="lab_ptv_EndraHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Endra Holdings LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EndraHoldingsLLCMember" xlink:href="ptv-20211231.xsd#ptv_EndraHoldingsLLCMember"/>
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    <link:label id="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_775aea52-7ece-496c-b97f-ddb94f99815d_terseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization</link:label>
    <link:label id="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortisation, intangible assets other than goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill"/>
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    <link:label id="lab_ptv_PerformanceSharePlanMember_a0f0894b-f6e1-4898-bed7-09bd7d51ce0e_terseLabel_en-US" xlink:label="lab_ptv_PerformanceSharePlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan [Member]</link:label>
    <link:label id="lab_ptv_PerformanceSharePlanMember_label_en-US" xlink:label="lab_ptv_PerformanceSharePlanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan [Member]</link:label>
    <link:label id="lab_ptv_PerformanceSharePlanMember_documentation_en-US" xlink:label="lab_ptv_PerformanceSharePlanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Share Plan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PerformanceSharePlanMember" xlink:href="ptv-20211231.xsd#ptv_PerformanceSharePlanMember"/>
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    <link:label id="lab_ptv_NontradingHoldingCompaniesAbstract_edf8a864-9b76-4ab8-8c59-577f69584531_terseLabel_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading holding companies</link:label>
    <link:label id="lab_ptv_NontradingHoldingCompaniesAbstract_label_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading holding companies [Abstract]</link:label>
    <link:label id="lab_ptv_NontradingHoldingCompaniesAbstract_documentation_en-US" xlink:label="lab_ptv_NontradingHoldingCompaniesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nontrading holding companies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NontradingHoldingCompaniesAbstract" xlink:href="ptv-20211231.xsd#ptv_NontradingHoldingCompaniesAbstract"/>
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    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_a9ff0d8d-a46a-4537-91cb-0835fd2c657e_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
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    <link:label id="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract_965b8a2a-16e9-4996-bf67-bff6088383fd_terseLabel_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers Shareholdings and Share Incentive awards [Abstract]</link:label>
    <link:label id="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract_label_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers Shareholdings and Share Incentive awards [Abstract]</link:label>
    <link:label id="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract_documentation_en-US" xlink:label="lab_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Directors and Senior Managers Shareholdings and Share Incentive awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract" xlink:href="ptv-20211231.xsd#ptv_DirectorsAndSeniorManagersShareholdingsAndShareIncentiveAwardsAbstract"/>
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    <link:label id="lab_ptv_UnusedFederalOrphanDrugTaxCredits_4abdada5-cd7d-4c11-a18c-7d30181277b1_terseLabel_en-US" xlink:label="lab_ptv_UnusedFederalOrphanDrugTaxCredits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused Federal orphan drug tax credits</link:label>
    <link:label id="lab_ptv_UnusedFederalOrphanDrugTaxCredits_label_en-US" xlink:label="lab_ptv_UnusedFederalOrphanDrugTaxCredits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused Federal orphan drug tax credits</link:label>
    <link:label id="lab_ptv_UnusedFederalOrphanDrugTaxCredits_documentation_en-US" xlink:label="lab_ptv_UnusedFederalOrphanDrugTaxCredits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused Federal orphan drug tax credits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_UnusedFederalOrphanDrugTaxCredits" xlink:href="ptv-20211231.xsd#ptv_UnusedFederalOrphanDrugTaxCredits"/>
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    <link:label id="lab_ptv_IssuedShareCapitalAcquired_b922c44b-fb21-4282-a310-f604b2d5c2ab_terseLabel_en-US" xlink:label="lab_ptv_IssuedShareCapitalAcquired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued Share capital acquired</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_IssuedShareCapitalAcquired" xlink:href="ptv-20211231.xsd#ptv_IssuedShareCapitalAcquired"/>
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    <link:label id="lab_ptv_DisclosureOfInformationAboutShareholdingsOfKeyManagementPersonnelExplanatoryTextBlock_label_en-US" xlink:label="lab_ptv_DisclosureOfInformationAboutShareholdingsOfKeyManagementPersonnelExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure Of Information About Shareholdings of Key Management Personnel Explanatory [Text Block]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates_59f0e4bb-5d05-478e-a541-928471bec112_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Associates</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for investment in associates [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:to="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueFromInterest_0b8d636c-310d-4e07-a93b-d1013036dea2_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueFromInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_ifrs-full_RevenueFromInterest_label_en-US" xlink:label="lab_ifrs-full_RevenueFromInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromInterest" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RevenueFromInterest"/>
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    <link:label id="lab_ptv_SubsidiaryPreferredSharesBalancesTable_7e3b2b7e-2fff-4d42-abb6-46e05946e9aa_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesBalancesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares Balances [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesBalancesTable_label_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesBalancesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares Balances [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryPreferredSharesBalancesTable_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPreferredSharesBalancesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Preferred Shares Balances [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryPreferredSharesBalancesTable" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryPreferredSharesBalancesTable"/>
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    <link:label id="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest_e174a5e5-5929-4dbd-9cb6-87a7578accb2_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary note conversion and changes in NCI ownership interest</link:label>
    <link:label id="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest_label_en-US" xlink:label="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary note conversion and changes in NCI ownership interest</link:label>
    <link:label id="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest_documentation_en-US" xlink:label="lab_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary note conversion and changes in NCI ownership interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryNoteConversionAndChangesInNCIOwnershipInterest"/>
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    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory_0f652054-4114-4727-b180-ce6f0c310d0b_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [text block]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [text block]</link:label>
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    <link:label id="lab_dei_TradingSymbol_21165abd-1a0b-4132-b5ab-03e07784a74d_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_label_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_TradingSymbol"/>
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    <link:label id="lab_ptv_BorrowingsNetLoanProceeds_705e8540-a305-4e2d-a688-79b820e7a61b_terseLabel_en-US" xlink:label="lab_ptv_BorrowingsNetLoanProceeds" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net loan proceeds</link:label>
    <link:label id="lab_ptv_BorrowingsNetLoanProceeds_label_en-US" xlink:label="lab_ptv_BorrowingsNetLoanProceeds" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, Net loan proceeds</link:label>
    <link:label id="lab_ptv_BorrowingsNetLoanProceeds_documentation_en-US" xlink:label="lab_ptv_BorrowingsNetLoanProceeds" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, Net loan proceeds</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BorrowingsNetLoanProceeds" xlink:href="ptv-20211231.xsd#ptv_BorrowingsNetLoanProceeds"/>
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    <link:label id="lab_ifrs-full_TradeAndOtherPayablesAbstract_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other payables [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherPayablesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TradeAndOtherPayablesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherPayablesAbstract" xlink:to="lab_ifrs-full_TradeAndOtherPayablesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables_b64c1921-63fa-4d17-8807-099321087976_terseLabel_en-US" xlink:label="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of property plant and equipment against trade and other payables</link:label>
    <link:label id="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables_label_en-US" xlink:label="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of property plant and equipment against trade and other payables</link:label>
    <link:label id="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables_documentation_en-US" xlink:label="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of property plant and equipment against trade and other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:href="ptv-20211231.xsd#ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables"/>
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    <link:label id="lab_ptv_SeniorManagersAbstract_a055af9c-93cb-49b3-a1de-c6a1f94879f9_terseLabel_en-US" xlink:label="lab_ptv_SeniorManagersAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Managers [Abstract]</link:label>
    <link:label id="lab_ptv_SeniorManagersAbstract_label_en-US" xlink:label="lab_ptv_SeniorManagersAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Managers [Abstract]</link:label>
    <link:label id="lab_ptv_SeniorManagersAbstract_documentation_en-US" xlink:label="lab_ptv_SeniorManagersAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Managers</link:label>
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    <link:label id="lab_ifrs-full_NotionalAmount_d64f7ca7-5596-4dfe-bec9-c89a97dff5ae_terseLabel_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregate principal amount</link:label>
    <link:label id="lab_ifrs-full_NotionalAmount_label_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notional amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NotionalAmount"/>
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    <link:label id="lab_ptv_ShortTermNoteFromAssociateMember_e61d5f99-3217-4fe9-ae2c-8ec9f79990d0_terseLabel_en-US" xlink:label="lab_ptv_ShortTermNoteFromAssociateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note from associate</link:label>
    <link:label id="lab_ptv_ShortTermNoteFromAssociateMember_label_en-US" xlink:label="lab_ptv_ShortTermNoteFromAssociateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note from associate [Member]</link:label>
    <link:label id="lab_ptv_ShortTermNoteFromAssociateMember_documentation_en-US" xlink:label="lab_ptv_ShortTermNoteFromAssociateMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term note from associate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShortTermNoteFromAssociateMember" xlink:href="ptv-20211231.xsd#ptv_ShortTermNoteFromAssociateMember"/>
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    <link:label id="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate_5a4a778f-758b-4889-b4e1-33d6cb58e0e6_terseLabel_en-US" xlink:label="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Executive Compensation</link:label>
    <link:label id="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of executive compensation, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rate of executive compensation, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_RateOfExecutiveCompensationReconciliationOfEffectiveTaxRate"/>
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    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_3cfb16b4-c47f-4cf6-9d31-991001d14014_terseLabel_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:to="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryAbstract_5eea7429-55d5-435a-b1c7-9eb64187c515_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary</link:label>
    <link:label id="lab_ptv_SubsidiaryAbstract_label_en-US" xlink:label="lab_ptv_SubsidiaryAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary [Abstract]</link:label>
    <link:label id="lab_ptv_SubsidiaryAbstract_documentation_en-US" xlink:label="lab_ptv_SubsidiaryAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryAbstract" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryAbstract"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_e9f83b82-f850-47a3-9de5-b6d32705b5b4_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity settled share-based payment expense</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for share-based payments</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory_92a3f1f4-6564-4d2b-b0eb-f7c89ef6a22d_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Development Costs</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExplanatory_6dc572de-1186-45df-9b0e-1706b9cf7f3b_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of credit risk</link:label>
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    <link:label id="lab_ptv_ContractBalancesTable_documentation_en-US" xlink:label="lab_ptv_ContractBalancesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract Balances [Table]</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost_28a9a3f5-a6cc-483b-8bde-d9046550aaaa_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on deconsolidation</link:label>
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    <link:label id="lab_ifrs-full_OperatingExpense_6692434c-4fd4-492b-a295-d8461f8b2618_totalLabel_en-US" xlink:label="lab_ifrs-full_OperatingExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total operating expense</link:label>
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    <link:label id="lab_ptv_SubsidiaryTypesAxis_93b6978b-6484-4f53-ac84-c70438c666c7_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryTypesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Types [Axis]</link:label>
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    <link:label id="lab_ptv_SubsidiaryTypesAxis_documentation_en-US" xlink:label="lab_ptv_SubsidiaryTypesAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Types</link:label>
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    <link:label id="lab_ifrs-full_StatementOfCashFlowsAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfCashFlowsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of cash flows [abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ptv_RecognisedIncomeTaxExpenseAbstract" xlink:href="ptv-20211231.xsd#ptv_RecognisedIncomeTaxExpenseAbstract"/>
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    <link:label id="lab_ptv_TransactionCostsReconciliationOfEffectiveTaxRate_label_en-US" xlink:label="lab_ptv_TransactionCostsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transaction Costs, reconciliation of effective tax rate</link:label>
    <link:label id="lab_ptv_TransactionCostsReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_TransactionCostsReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transaction Costs, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TransactionCostsReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_TransactionCostsReconciliationOfEffectiveTaxRate"/>
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    <link:label id="lab_ptv_NumberOfSharesHeldByPureTech_9f2df538-501c-4709-9723-f6f4da13e84b_terseLabel_en-US" xlink:label="lab_ptv_NumberOfSharesHeldByPureTech" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Shares Held by PureTech</link:label>
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    <link:label id="lab_ptv_TerminalValueGrowthRateMeasurementInputMember_bc449c4e-4c4e-40ed-a00e-5a9d3f5ab692_terseLabel_en-US" xlink:label="lab_ptv_TerminalValueGrowthRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Terminal value growth rate</link:label>
    <link:label id="lab_ptv_TerminalValueGrowthRateMeasurementInputMember_label_en-US" xlink:label="lab_ptv_TerminalValueGrowthRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Terminal value growth rate, measurement input [Member]</link:label>
    <link:label id="lab_ptv_TerminalValueGrowthRateMeasurementInputMember_documentation_en-US" xlink:label="lab_ptv_TerminalValueGrowthRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Terminal value growth rate, measurement input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TerminalValueGrowthRateMeasurementInputMember" xlink:href="ptv-20211231.xsd#ptv_TerminalValueGrowthRateMeasurementInputMember"/>
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    <link:label id="lab_ifrs-full_CarryingAmountMember_4363de0f-3bc8-435b-8351-8d911e650e56_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Carrying Amount</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Carrying amount [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CarryingAmountMember"/>
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    <link:label id="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable_584edefe-3079-49b2-9110-f8b56c03884e_terseLabel_en-US" xlink:label="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax losses and tax credits carryforwards [Table]</link:label>
    <link:label id="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable_label_en-US" xlink:label="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax losses and tax credits carryforwards [Table]</link:label>
    <link:label id="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable_documentation_en-US" xlink:label="lab_ptv_TaxLossesAndTaxCreditsCarryforwardsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax losses and tax credits carryforwards [Table]</link:label>
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    <link:label id="lab_ifrs-full_ContractualCapitalCommitments_96a3eaca-22fc-425e-a855-93e30de8bae9_terseLabel_en-US" xlink:label="lab_ifrs-full_ContractualCapitalCommitments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-cancellable contractual commitments</link:label>
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    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesAxis_87edd472-3abb-4dd6-b217-25839753dc68_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Categories of related parties [axis]</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment_34fc7795-34ef-40c9-8b2f-469f7c6a0d64_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss on disposal of assets</link:label>
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    <link:label id="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember_c07c0e6b-4e91-4e8e-aad5-7d2fc237dc26_terseLabel_en-US" xlink:label="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Volatility</link:label>
    <link:label id="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember_49e358bf-561e-424f-8cb7-9a45e1385d2b_verboseLabel_en-US" xlink:label="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected volatility</link:label>
    <link:label id="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember_label_en-US" xlink:label="lab_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Historical volatility for shares, measurement input [member]</link:label>
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    <link:label id="lab_ptv_BorrowingsOther_b86d69af-19c5-4aec-bcd8-a9c3ee2a7d68_terseLabel_en-US" xlink:label="lab_ptv_BorrowingsOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ptv_BorrowingsOther_label_en-US" xlink:label="lab_ptv_BorrowingsOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, other</link:label>
    <link:label id="lab_ptv_BorrowingsOther_documentation_en-US" xlink:label="lab_ptv_BorrowingsOther" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_BorrowingsOther" xlink:href="ptv-20211231.xsd#ptv_BorrowingsOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_BorrowingsOther" xlink:to="lab_ptv_BorrowingsOther" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward_684bd1e7-27cc-4e63-b103-9a2cdc45d20a_terseLabel_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Roll Forward]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward_label_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares [Roll Forward]</link:label>
    <link:label id="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward_documentation_en-US" xlink:label="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in the value of subsidiary preferred shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:href="ptv-20211231.xsd#ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:to="lab_ptv_ChangesInTheValueOfSubsidiaryPreferredSharesRollForward" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SubsidiaryNotesPayableLoansTable_27296fe5-20b6-4af3-9d12-674e85262673_terseLabel_en-US" xlink:label="lab_ptv_SubsidiaryNotesPayableLoansTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Notes Payable - Loans [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryNotesPayableLoansTable_label_en-US" xlink:label="lab_ptv_SubsidiaryNotesPayableLoansTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Notes Payable - Loans [Table]</link:label>
    <link:label id="lab_ptv_SubsidiaryNotesPayableLoansTable_documentation_en-US" xlink:label="lab_ptv_SubsidiaryNotesPayableLoansTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Notes Payable - Loans [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SubsidiaryNotesPayableLoansTable" xlink:href="ptv-20211231.xsd#ptv_SubsidiaryNotesPayableLoansTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SubsidiaryNotesPayableLoansTable" xlink:to="lab_ptv_SubsidiaryNotesPayableLoansTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_53bb1097-a0ab-443c-9565-72bcfdd3ea46_verboseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Options exercisable (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_3898cc02-895b-4766-b11d-dd3e06a10415_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of options</link:label>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_label_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of share options exercisable in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
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    <link:label id="lab_ptv_TradeReceivablesIncomeTaxReceivable_78238565-d05d-4a6c-8db2-f71b51bf1432_terseLabel_en-US" xlink:label="lab_ptv_TradeReceivablesIncomeTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income tax receivable - current</link:label>
    <link:label id="lab_ptv_TradeReceivablesIncomeTaxReceivable_label_en-US" xlink:label="lab_ptv_TradeReceivablesIncomeTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade receivables, income tax receivable</link:label>
    <link:label id="lab_ptv_TradeReceivablesIncomeTaxReceivable_documentation_en-US" xlink:label="lab_ptv_TradeReceivablesIncomeTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade receivables, income tax receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_TradeReceivablesIncomeTaxReceivable" xlink:href="ptv-20211231.xsd#ptv_TradeReceivablesIncomeTaxReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_TradeReceivablesIncomeTaxReceivable" xlink:to="lab_ptv_TradeReceivablesIncomeTaxReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromExerciseOfOptions_ecd4470a-48a1-4bb3-bc0d-11a26e072c11_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfOptions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise of stock options</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromExerciseOfOptions_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfOptions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from exercise of options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromExerciseOfOptions" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ProceedsFromExerciseOfOptions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromExerciseOfOptions" xlink:to="lab_ifrs-full_ProceedsFromExerciseOfOptions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_e0826a44-1f59-4d3c-bb0b-ba144bf1d901_terseLabel_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Translation reserve [member]</link:label>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_label_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reserve of exchange differences on translation [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:to="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_0567cfd4-19c6-4456-b8c3-3001069d2819_terseLabel_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_label_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageShares_d777c985-18c8-451b-93bc-979015973dc5_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average number of ordinary shareholders at December 31,</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageShares_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average number of ordinary shares used in calculating basic earnings per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_WeightedAverageShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageShares" xlink:to="lab_ifrs-full_WeightedAverageShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UnrecognisedShareOfLossesOfAssociates_de447cdc-a8f6-4fbe-8da7-fb3e54c77c09_terseLabel_en-US" xlink:label="lab_ifrs-full_UnrecognisedShareOfLossesOfAssociates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognised share of losses of associates</link:label>
    <link:label id="lab_ifrs-full_UnrecognisedShareOfLossesOfAssociates_label_en-US" xlink:label="lab_ifrs-full_UnrecognisedShareOfLossesOfAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognised share of losses of associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnrecognisedShareOfLossesOfAssociates" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_UnrecognisedShareOfLossesOfAssociates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UnrecognisedShareOfLossesOfAssociates" xlink:to="lab_ifrs-full_UnrecognisedShareOfLossesOfAssociates" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties_fa4939a0-24ea-4884-9990-4dbe8c6dc9de_terseLabel_en-US" xlink:label="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non controlling interests and options issued to third parties</link:label>
    <link:label id="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties_label_en-US" xlink:label="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non controlling interests and options issued to third parties</link:label>
    <link:label id="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties_documentation_en-US" xlink:label="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non controlling interests and options issued to third parties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:href="ptv-20211231.xsd#ptv_NonControllingInterestsAndOptionsIssuedToThirdParties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:to="lab_ptv_NonControllingInterestsAndOptionsIssuedToThirdParties" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorFirmId_1a89a78f-6e96-43ff-a778-646f8ec55f22_terseLabel_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:label id="lab_dei_AuditorFirmId_label_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorFirmId" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AuditorFirmId"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorFirmId" xlink:to="lab_dei_AuditorFirmId" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock_902c5b24-1841-4b86-b4f5-83eb06792018_terseLabel_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Significant unobservable Inputs - Investments at Fair Value, Assets</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock_label_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments, Significant unobservable Inputs - Investments at Fair Value, Assets [Text Block]</link:label>
    <link:label id="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock_documentation_en-US" xlink:label="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instruments, Significant unobservable Inputs - Investments at Fair Value, Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:href="ptv-20211231.xsd#ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:to="lab_ptv_FinancialInstrumentsSignificantUnobservableInputsInvestmentsAtFairValueAssetsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PreferredShareWarrantsMember_e3b049c2-44be-48d0-9b63-4ccab80d68d5_terseLabel_en-US" xlink:label="lab_ptv_PreferredShareWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred share warrants</link:label>
    <link:label id="lab_ptv_PreferredShareWarrantsMember_label_en-US" xlink:label="lab_ptv_PreferredShareWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred share warrants [Member]</link:label>
    <link:label id="lab_ptv_PreferredShareWarrantsMember_documentation_en-US" xlink:label="lab_ptv_PreferredShareWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred share warrants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PreferredShareWarrantsMember" xlink:href="ptv-20211231.xsd#ptv_PreferredShareWarrantsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PreferredShareWarrantsMember" xlink:to="lab_ptv_PreferredShareWarrantsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NotesPayableLineItems_cbb043bf-b740-4f32-98aa-79a70754644e_terseLabel_en-US" xlink:label="lab_ptv_NotesPayableLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Payable [Line Items]</link:label>
    <link:label id="lab_ptv_NotesPayableLineItems_label_en-US" xlink:label="lab_ptv_NotesPayableLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Payable [Line Items]</link:label>
    <link:label id="lab_ptv_NotesPayableLineItems_documentation_en-US" xlink:label="lab_ptv_NotesPayableLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NotesPayableLineItems" xlink:href="ptv-20211231.xsd#ptv_NotesPayableLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NotesPayableLineItems" xlink:to="lab_ptv_NotesPayableLineItems" xlink:type="arc" order="1"/>
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    <link:label id="lab_ptv_SubsidiaryPlansAbstract_documentation_en-US" xlink:label="lab_ptv_SubsidiaryPlansAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiary Plans</link:label>
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    <link:label id="lab_ifrs-full_UndiscountedFinanceLeasePaymentsToBeReceived_42fceeb3-2953-4d14-8ebe-dab9aa95c506_terseLabel_en-US" xlink:label="lab_ifrs-full_UndiscountedFinanceLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Undiscounted finance lease payments to be received</link:label>
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    <link:label id="lab_ptv_InterestExpenseReconciliationOfEffectiveTaxRate_documentation_en-US" xlink:label="lab_ptv_InterestExpenseReconciliationOfEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense, reconciliation of effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_InterestExpenseReconciliationOfEffectiveTaxRate" xlink:href="ptv-20211231.xsd#ptv_InterestExpenseReconciliationOfEffectiveTaxRate"/>
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    <link:label id="lab_ptv_EarningslossPerShareAbstract_35801b67-a7f8-48f0-8dcb-81c5a9f27755_terseLabel_en-US" xlink:label="lab_ptv_EarningslossPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(loss) per share</link:label>
    <link:label id="lab_ptv_EarningslossPerShareAbstract_label_en-US" xlink:label="lab_ptv_EarningslossPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(loss) per share [Abstract]</link:label>
    <link:label id="lab_ptv_EarningslossPerShareAbstract_documentation_en-US" xlink:label="lab_ptv_EarningslossPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings/(loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_EarningslossPerShareAbstract" xlink:href="ptv-20211231.xsd#ptv_EarningslossPerShareAbstract"/>
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    <link:label id="lab_ptv_TotalShareBasedPaymentsExpenseCategoryMember_documentation_en-US" xlink:label="lab_ptv_TotalShareBasedPaymentsExpenseCategoryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Share-based Payments Expense Category</link:label>
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    <link:label id="lab_ptv_ProbabilityWeightedExpectedReturnMethodMember_documentation_en-US" xlink:label="lab_ptv_ProbabilityWeightedExpectedReturnMethodMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Probability Weighted Expected Return Method</link:label>
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    <link:label id="lab_ifrs-full_UnusedTaxLossesMember_01d1d70b-712f-48c5-89b2-d0415ca52f33_terseLabel_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating tax losses</link:label>
    <link:label id="lab_ifrs-full_UnusedTaxLossesMember_label_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused tax losses [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnusedTaxLossesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_UnusedTaxLossesMember"/>
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    <link:label id="lab_ptv_DisclosureOfEquityTextBlock_bfe67bba-6f4c-4257-8648-c202467bdeac_terseLabel_en-US" xlink:label="lab_ptv_DisclosureOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity</link:label>
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    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_3f18f2ea-3e33-435c-b484-f6f5c50204d7_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Components of equity [axis]</link:label>
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    <link:label id="lab_ptv_ShortTermAndLongTermOfLeaseReceivablesTable_b03ff168-bc12-426b-b947-14a2bed38330_terseLabel_en-US" xlink:label="lab_ptv_ShortTermAndLongTermOfLeaseReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term and Long-term of lease receivables [Table]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_05822d86-1892-4307-b83f-8e1f526c267c_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxation</link:label>
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    <link:label id="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock_947b2907-2cc1-41f1-ad8a-db46a1294d3d_terseLabel_en-US" xlink:label="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Financial information of Gelesis</link:label>
    <link:label id="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock_label_en-US" xlink:label="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Financial information of Gelesis [Text Block]</link:label>
    <link:label id="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock_documentation_en-US" xlink:label="lab_ptv_SummaryOfFinancialInformationOfGelesisTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Financial information of Gelesis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SummaryOfFinancialInformationOfGelesisTextBlock" xlink:href="ptv-20211231.xsd#ptv_SummaryOfFinancialInformationOfGelesisTextBlock"/>
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    <link:label id="lab_ifrs-full_NetAssetsLiabilities_a8d712b2-906a-46ac-a143-27184a001d14_totalLabel_en-US" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets/(liabilities)</link:label>
    <link:label id="lab_ifrs-full_NetAssetsLiabilities_927e492d-9315-4d8e-83ff-139e0a791357_terseLabel_en-US" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets/(liabilities)</link:label>
    <link:label id="lab_ifrs-full_NetAssetsLiabilities_label_en-US" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets (liabilities)</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetAssetsLiabilities" xlink:to="lab_ifrs-full_NetAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory_5cba02b8-33b4-49e8-9853-885b6a248cdd_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-controlling Interest</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of non-controlling interests [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices_d3323061-9c2c-4321-b021-651574b38f38_terseLabel_en-US" xlink:label="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prepaid expenses for expected subsidiary IPO, Audit related assurance services</link:label>
    <link:label id="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices_label_en-US" xlink:label="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prepaid expenses for expected subsidiary IPO, Audit related assurance services</link:label>
    <link:label id="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices_documentation_en-US" xlink:label="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prepaid expenses for expected subsidiary IPO, Audit related assurance services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:href="ptv-20211231.xsd#ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:to="lab_ptv_PrepaidExpensesForExpectedSubsidiaryIPOAuditRelatedAssuranceServices" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract_843de3b7-5c38-49a8-8882-e399fa2e193e_terseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Comprehensive income/(loss) attributable to:</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract_03cc25a7-e846-481f-8bdf-459ca9a29258_verboseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total comprehensive income/(loss) attributable to:</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract_label_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Comprehensive income attributable to [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:to="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AdditionsLeaseLiabilities_64c59a47-7cf1-47a4-9dad-2b3050cd479e_terseLabel_en-US" xlink:label="lab_ptv_AdditionsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions</link:label>
    <link:label id="lab_ptv_AdditionsLeaseLiabilities_label_en-US" xlink:label="lab_ptv_AdditionsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions Lease Liabilities</link:label>
    <link:label id="lab_ptv_AdditionsLeaseLiabilities_documentation_en-US" xlink:label="lab_ptv_AdditionsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additions Lease Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AdditionsLeaseLiabilities" xlink:href="ptv-20211231.xsd#ptv_AdditionsLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AdditionsLeaseLiabilities" xlink:to="lab_ptv_AdditionsLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_3ac72428-c434-4d67-ac7c-0e6cc8ff2f62_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory_bcb1215c-192a-44ba-a283-a44bf3fcf78f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of subsidiaries</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of subsidiaries [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseThroughVestingOfRSU_07bd7e76-669b-4e6c-bd90-1b87b4ce0d11_terseLabel_en-US" xlink:label="lab_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting of restricted stock units (RSU)</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughVestingOfRSU_label_en-US" xlink:label="lab_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease through vesting of RSU</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughVestingOfRSU_documentation_en-US" xlink:label="lab_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase Decrease through vesting of RSU</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:href="ptv-20211231.xsd#ptv_IncreaseDecreaseThroughVestingOfRSU"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:to="lab_ptv_IncreaseDecreaseThroughVestingOfRSU" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn_e71755a5-2b7b-4054-8e6e-cb8e101463d1_terseLabel_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries included in the Group consolidated federal tax return</link:label>
    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn_label_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries included in the Group consolidated federal tax return</link:label>
    <link:label id="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn_documentation_en-US" xlink:label="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage vote and value of subsidiaries included in the Group consolidated federal tax return</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:href="ptv-20211231.xsd#ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:to="lab_ptv_PercentageVoteAndValueOfSubsidiariesIncludedInTheGroupConsolidatedFederalTaxReturn" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_64d84c7f-0430-4465-84e0-572e69f731ec_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of changes in equity classified non-controlling ownership interests in subsidiaries</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of interests in subsidiaries [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_FinanceIncomeAbstract_8b3fcdbf-92cd-4eb3-8b49-e92487ac2d8f_terseLabel_en-US" xlink:label="lab_ptv_FinanceIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income [Abstract]</link:label>
    <link:label id="lab_ptv_FinanceIncomeAbstract_label_en-US" xlink:label="lab_ptv_FinanceIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income [Abstract]</link:label>
    <link:label id="lab_ptv_FinanceIncomeAbstract_documentation_en-US" xlink:label="lab_ptv_FinanceIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinanceIncomeAbstract" xlink:href="ptv-20211231.xsd#ptv_FinanceIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_FinanceIncomeAbstract" xlink:to="lab_ptv_FinanceIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AdjustmentsLeaseLiabilities_8e2a0644-77aa-409a-93dc-e25812af05c9_terseLabel_en-US" xlink:label="lab_ptv_AdjustmentsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments</link:label>
    <link:label id="lab_ptv_AdjustmentsLeaseLiabilities_label_en-US" xlink:label="lab_ptv_AdjustmentsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments, lease liabilities</link:label>
    <link:label id="lab_ptv_AdjustmentsLeaseLiabilities_documentation_en-US" xlink:label="lab_ptv_AdjustmentsLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments, lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AdjustmentsLeaseLiabilities" xlink:href="ptv-20211231.xsd#ptv_AdjustmentsLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AdjustmentsLeaseLiabilities" xlink:to="lab_ptv_AdjustmentsLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities_f514ff3f-ee4e-47d5-b325-d8c62a0859ee_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Range</link:label>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities_d489a846-4e66-41ea-a2a2-5ee8c81e9f78_terseLabel_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Range</link:label>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities_label_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of reasonably possible decrease in unobservable input, liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:to="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:type="arc" order="1"/>
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