The DOMAIN table includes a list of OMOP-defined Domains the Concepts of the Standardized Vocabularies can belong to. A Domain defines the set of allowable Concepts for the standardized fields in the CDM tables. For example, the “Condition” Domain contains Concepts that describe a condition of a patient, and these Concepts can only be stored in the condition_concept_id field of the CONDITION_OCCURRENCE and CONDITION_ERA tables. This reference table is populated with a single record for each Domain and includes a descriptive name for the Domain.
|domain_id||Yes||varchar(20)||A unique key for each domain.|
|domain_name||Yes||varchar(255)||The name describing the Domain, e.g. “Condition”, “Procedure”, “Measurement” etc.|
|domain_concept_id||Yes||integer||A foreign key that refers to an identifier in the CONCEPT table for the unique Domain Concept the Domain record belongs to.|