Page History

The Related Records (RELREC) special-purpose dataset is used to describe relationships between records for a subject and relationships between datasets. RELREC will not be used to represent relationships already represented in Supplemental Qualifier (SUPP–) datasets for nonstandard variables or Comments (CO) for unstructured free-text.

Relationships  In both cases, relationships represented in RELREC are collected relationships. The RELREC dataset should be used to represent either:

• Explicit relationships, (e.g., concomitant medications taken as a result of an adverse event); or
• Information of a nature that necessitates using multiple datasets and that may need to be examined together for analysis or proper interpretation.  

...

Subject records or datasets expressing a relationship are specified using the key variables STUDYID, RDOMAIN (the domain code of the record or dataset in the relationship) with IDVAR (the variable that identifies the related record(s)). Each record in the RELREC special-purpose dataset contains keys that identify a record (or group of records) and an identifier for the relationship which is stored in the RELID variable. The value of RELID is chosen by the applicant and it is recommended that applicants use a standard system or naming convention for RELID (e.g., all letters, all numbers, capitalized).

...