Hi Team,

We have a few queries for below mentioned criteria. 

FirstLabTestAfterHospitalizationStart(LabList List<QDM.PositiveLaboratoryTestPerformed>)
  "Inpatient Encounters" Encounter
    let FirstLab: First(LabList Lab
     where Global."EarliestOf"(Lab.relevantDatetime, Lab.relevantPeriod) during Global."HospitalizationWithObservationAndOutpatientSurgeryService"(Encounter)
      and Lab.result is not null
       sort by resultDatetime  )
        where FirstLab is not null
         return

{           EncounterId: Encounter.id,           FirstResult: FirstLab.result as Quantity,           Timing: FirstLab.resultDatetime           }

Query 1:
From the statements we understand, Lab.relevantDatetime, Lab.relevantPeriod should be validated during Global."HospitalizationWithObservationAndOutpatientSurgeryService".
However, return value should for timing should be considered from QDM attribute resultDatetime.
Kindly confirm on our understanding.

Query 2:
Can Lab.relevantDatetime and resultDatetime have a different value?

Request you to respond at the earliest as our client deliverables are dependent on it.