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- The concept_id of a Concept is persistent, i.e. stays the same for the same Concept between releases of
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the Standardized Vocabularies.
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- A descriptive name for each Concept is stored as the Concept Name as part of the CONCEPT table. Additional
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names and descriptions for the Concept are stored as Synonyms in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_synonym)
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names and descriptions for the Concept are stored as Synonyms in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_synonym)
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table.
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- Each Concept is assigned to a Domain. For Standard Concepts, there is always a single Domain. Source
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Concepts can be composite or coordinated entities, and therefore can belong to more than one Domain.
@@ -61,7 +61,7 @@ field and can be used to reference the source vocabulary.
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in all *_concept_id fields, whereas Classification Concepts (‘C’) should not appear in the CDM
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data, but participate in the construction of the CONCEPT_ANCESTOR table and can be used to
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identify Descendants that may appear in the data. See CONCEPT_ANCESTOR table. Non-standard
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Concepts can only appear in *_source_concept_id fields and are not used in [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_ancestor)
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Concepts can only appear in *_source_concept_id fields and are not used in [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_ancestor)
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table. Please refer to the Standardized Vocabularies specifications for details of the Standard Concept
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designation.
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- The lifespan of a Concept is recorded through its valid_start_date, valid_end_date and the invalid_
@@ -144,10 +144,10 @@ and the relationship_id replaced by the reverse_relationship_id from the RELATIO
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not necessary to query for the existence of a relationship both in the concept_id_1 and concept_id_2
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fields.
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- Concept Relationships define direct relationships between Concepts. Indirect relationships through 3rd
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Concepts are not captured in this table. However, the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_ancestor) table does this for
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Concepts are not captured in this table. However, the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_ancestor) table does this for
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hierarchical relationships over several “generations” of direct relationships.
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- In previous versions of the CDM, the relationship_id used to be a numerical identifier. See the
@@ -163,7 +163,7 @@ Relationship is provided in the reverse_relationship_id field.
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concept_id field. This is for purposes of creating a closed Information Model, where all entities in
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the OMOP CDM are covered by unique Concepts.
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- Hierarchical Relationships are used to build a hierarchical tree out of the Concepts, which is recorded in
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the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_ancestor) table. For example, “has_ingredient” is a Relationship between Concept
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the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_ancestor) table. For example, “has_ingredient” is a Relationship between Concept
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of the Concept Class ‘Clinical Drug’ and those of ‘Ingredient’, and all Ingredients can be classified as
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the “parental” hierarchical Concepts for the drug products they are part of. All ‘Is a’ Relationships are
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hierarchical.
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### Concept Synonyms
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- The concept_synonym_name field contains a valid Synonym of a concept, including the description in
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the concept_name itself. I.e. each Concept has at least one Synonym in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_synonym)
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the concept_name itself. I.e. each Concept has at least one Synonym in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_synonym)
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table. As an example, for a SNOMED-CT Concept, if the fully specified name is stored as the
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concept_name of the [CONCEPT](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept) table, then the Preferred Term and Synonyms associated with the Concept are stored in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_synonym) table.
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- Only Synonyms that are active and current are stored in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_synonym) table. Tracking
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concept_name of the [CONCEPT](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept) table, then the Preferred Term and Synonyms associated with the Concept are stored in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_synonym) table.
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- Only Synonyms that are active and current are stored in the [CONCEPT_SYNONYM](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_synonym) table. Tracking
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synonym/description history and mapping of obsolete synonyms to current Concepts/Synonyms is out
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of scope for the Standard Vocabularies.
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- Currently, only English Synonyms are included.
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### Concept Ancestor
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- Each concept is also recorded as an ancestor of itself.
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- Only valid and Standard Concepts participate in the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_ancestor) table. It is not possible
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- Only valid and Standard Concepts participate in the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_ancestor) table. It is not possible
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to find ancestors or descendants of deprecated or Source Concepts.
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- Usually, only Concepts of the same Domain are connected through records of the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm531.html#concept_ancestor) table, but there might be exceptions.
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- Usually, only Concepts of the same Domain are connected through records of the [CONCEPT_ANCESTOR](https://ohdsi.github.io/CommonDataModel/cdm54.html#concept_ancestor) table, but there might be exceptions.
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### Source to Concept Map
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- This table is no longer used to distribute mapping information between source codes and Standard
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