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  <element id="qtrx_LetterOfCreditReducedAt65MonthsAfterCommencementDate" name="LetterOfCreditReducedAt65MonthsAfterCommencementDate" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodValueStockOptionsAndVestingRestrictedStockExercised" name="StockIssuedDuringPeriodValueStockOptionsAndVestingRestrictedStockExercised" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodSharesStockOptionsAndVestingRestrictedStockExercised" name="StockIssuedDuringPeriodSharesStockOptionsAndVestingRestrictedStockExercised" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ExclusiveAgreementMember" name="ExclusiveAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_MinimumNumberOfCustomers" name="MinimumNumberOfCustomers" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_PeriodOfPaymentFromCustomers" name="PeriodOfPaymentFromCustomers" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ServiceTypeWarrantiesMember" name="ServiceTypeWarrantiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ResearchServicesMember" name="ResearchServicesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_UndeliveredServicesRelatedToInitialAndExtendedServiceTypeWarrantiesAndResearchServicesMember" name="UndeliveredServicesRelatedToInitialAndExtendedServiceTypeWarrantiesAndResearchServicesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_UndeliveredLicensesOfIntellectualPropertyMember" name="UndeliveredLicensesOfIntellectualPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ScheduleOfChangesInDeferredRevenueFromContractsWithCustomersTableTextBlock" name="ScheduleOfChangesInDeferredRevenueFromContractsWithCustomersTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ContractWithCustomerLiabilityDeferralOfRevenue" name="ContractWithCustomerLiabilityDeferralOfRevenue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CapitalizedContractCostAdoptionAdjustment" name="CapitalizedContractCostAdoptionAdjustment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CapitalizedContractCostDeferralOfCostsToObtainContract" name="CapitalizedContractCostDeferralOfCostsToObtainContract" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CapitalizedContractCostRecognitionOfCostsToObtainContract" name="CapitalizedContractCostRecognitionOfCostsToObtainContract" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_IncreaseDecreaseInPayablesForContractAcquisitionCosts" name="IncreaseDecreaseInPayablesForContractAcquisitionCosts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AtMarketOfferingMember" name="AtMarketOfferingMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CapitalExpendituresIncurredIncludedInNoncurrentLiabilities" name="CapitalExpendituresIncurredIncludedInNoncurrentLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_GrossProceedsFromIssuanceOfCommonStock" name="GrossProceedsFromIssuanceOfCommonStock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_UmandiagnosticsAbAcquisitionMember" name="UmandiagnosticsAbAcquisitionMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_BusinessCombinationConsiderationTransferredCommonStockShares" name="BusinessCombinationConsiderationTransferredCommonStockShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_BusinessCombinationCapitalStockSharesOustandingPercentage" name="BusinessCombinationCapitalStockSharesOustandingPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
