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StandardizedVocabularies/DOMAIN.md

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*OMOP Common Data Model v5.1 Specifications*
<br>*Authors: Christian Reich, Patrick Ryan, Rimma Belenkaya, Karthik Natarajan, Clair Blacketer*
<br>***Release date needed***
[Back to Table of Contents](https://github.com/OHDSI/CommonDataModel/blob/master/Documentation/TableofContents.md)
<br>[Back to Standardized Vocabularies](StandardizedVocabularies.md)
---
# 3.3 DOMAIN
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](https://github.com/OHDSI/CommonDataModel/blob/master/Documentation/StandardizedClinicalDataTables/CONDITION_OCCURRENCE.md) and [CONDITION_ERA](https://github.com/OHDSI/CommonDataModel/blob/master/Documentation/StandardizedDerivedElements/CONDITION_ERA.md) tables. This reference table is populated with a single record for each Domain and includes a descriptive name for the Domain.
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](https://github.com/OHDSI/CommonDataModel/wiki/CONDITION_OCCURRENCE) and [CONDITION_ERA](https://github.com/OHDSI/CommonDataModel/wiki/CONDITION_ERA) tables. This reference table is populated with a single record for each Domain and includes a descriptive name for the Domain.
Field|Required|Type|Description
:----|:----|:----|:-----
|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](CONCEPT.md) table for the unique Domain Concept the Domain record belongs to.|
|domain_concept_id|Yes|integer|A foreign key that refers to an identifier in the [CONCEPT](https://github.com/OHDSI/CommonDataModel/wiki/CONCEPT) table for the unique Domain Concept the Domain record belongs to.|
## Conventions