Version Domain Sequence Variable Label Type Controlled Terminology or Format Role CDISC Notes Core
SDTMIG 3.3 SV 1 STUDYID Study Identifier Char Identifier Unique identifier for a study. Req
SDTMIG 3.3 SV 2 DOMAIN Domain Abbreviation Char SV Identifier Two-character abbreviation for the domain. Req
SDTMIG 3.3 SV 3 USUBJID Unique Subject Identifier Char Identifier Identifier used to uniquely identify a subject across all studies for all applications or submissions involving the product. Req
SDTMIG 3.3 SV 4 VISITNUM Visit Number Num Topic 1. Clinical encounter number. (Decimal numbering may be useful for inserting unplanned visits.) 2. Numeric version of VISIT, used for sorting. Req
SDTMIG 3.3 SV 5 VISIT Visit Name Char Synonym Qualifier 1. Protocol-defined description of clinical encounter. 2. May be used in addition to VISITNUM and/or VISITDY as a text description of the clinical encounter. Perm
SDTMIG 3.3 SV 6 VISITDY Planned Study Day of Visit Num Timing Planned study day of the start of the visit based upon RFSTDTC in Demographics. Perm
SDTMIG 3.3 SV 7 SVSTDTC Start Date/Time of Visit Char ISO 8601 Timing Start date/time for a Visit. Exp
SDTMIG 3.3 SV 8 SVENDTC End Date/Time of Visit Char ISO 8601 Timing End date/time of a Visit. Exp
SDTMIG 3.3 SV 9 SVSTDY Study Day of Start of Visit Num Timing Study day of start of visit relative to the sponsor-defined RFSTDTC. Perm
SDTMIG 3.3 SV 10 SVENDY Study Day of End of Visit Num Timing Study day of end of visit relative to the sponsor-defined RFSTDTC. Perm
SDTMIG 3.3 SV 11 SVUPDES Description of Unplanned Visit Char Synonym Qualifier Description of what happened to the subject during an unplanned visit. Perm