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This section describes how the SDTM may be implemented to describe distinct relationships. Sets of variables used to represent relationships are detailed in the following sections. All relationships make use of the relationships between records in the same dataset and between records in different datasets. 


All relationships are represented  standard domain identifiers STUDYID, DOMAIN, and USUBJID. Variables IDVAR and IDVARVAL are used as applicable to represent variables and values which relate records by acting as record-level merge/join keys between datasets. In such cases, IDVAR and IDVARVAL the names of variables and specific variable values which relate records by acting as

 The following are examples of variables that could be used in IDVAR:

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