A Special SDTM Domain RELREC and its Application

The Related Records (RELREC) domain is a Special-Purpose Relationship domain in the Study Data Tabulation Model (SDTM). It is used to identify relationships between records in two (or more) domains. The relationship is sometimes important and unique for analysis. This paper discusses the basic attributes and meaning of the RELREC domain, as well as how to use different types of relationships in RELREC to facilitate analysis.