VariableName VariableLabel Type Role Note Core
STUDYID Study Identifier Char Identifier Unique identifier for a study. Req
DOMAIN Domain Abbreviation Char Identifier Two-character abbreviation for the domain. Req
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
DSSEQ Sequence Number Num Identifier Sequence Number given to ensure uniqueness of subject records within a domain. May be any valid number. Req
DSGRPID Group ID Char Identifier Used to tie together a block of related records in a single domain for a subject. Perm
DSREFID Reference ID Char Identifier Internal or external identifier. Perm
DSSPID Sponsor-Defined Identifier Char Identifier Sponsor-defined reference number. Perhaps pre-printed on the CRF as an explicit line identifier or defined in the sponsor’s operational database. Example: Line number on a Disposition page. Perm
DSTERM Reported Term for the Disposition Event Char Topic Verbatim name of the event or protocol milestone. Some terms in DSTERM will match DSDECOD, but others, such as “Subject moved” will map to controlled terminology in DSDECOD, such as “LOST TO FOLLOW-UP.” Req
DSDECOD Standardized Disposition Term Char Synonym Qualifier Controlled terminology for the name of disposition event or protocol milestone. Examples of protocol milestones: INFORMED CONSENT OBTAINED, RANDOMIZED Req
DSCAT Category for Disposition Event Char Grouping Qualifier Used to define a category of related records. DSCAT is now an “Expected” variable. DSCAT was permissible in SDTMIG 3.1.1 and earlier versions. Thechange from “permissible” to “expected” is based on the requirement to distinguish protocol milestones and/or other events from disposition events. DSCAT may be null if there are only “disposition events”; however, it is recommended that DSCAT always be populated. Exp
DSSCAT Subcategory for Disposition Event Char Grouping Qualifier A further categorization of disposition event. Perm
EPOCH Epoch Char Timing EPOCH may be used when DSCAT = “DISPOSITION EVENT”. Examples: SCREENING, TREATMENT, FOLLOW-UP Perm
DSDTC Date/Time of Collection Char Timing Perm
DSSTDTC Start Date/Time of Disposition Event Char Timing Exp
DSSTDY Study Day of Start of Disposition Event Num Timing Study day of start of event relative to the sponsor-defined RFSTDTC. Perm