C82517Level 5

Observation Start Date Time

**Semantic type:** Temporal Concept

**Definition:** The start date or date and time of the observation.

**Synonyms:** - STDTC

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C117455Date and Time of First Study Treatment

C117496Exposure as Collected Start Date and Time of Treatment

C117529Start Date and Time of Procedure

C124009Healthcare Encounters Start Date Time

C221773Date and/or Time of First Challenge Agent Administration

C83215Adverse Event Start Date Time

C83235Concomitant Medication Use Start Date Time

C83251Disposition Event Start Date Time

C83288Exposure Start Date Time

C83338Medical History Event Start Date Time

C83395Subject Reference Start Date Time

C83411Subject Element Start Date Time

C83431Substance Use Start Date Time

C83436Subject Visit Start Date Time

C87995Protocol Deviation Start Date Time

C90459Start Date Time Of Dose Interval

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