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UMLS API
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UMLS API

The U.S. National Library of Medicine’s UMLS API supports searching biomedical terms, concepts, and relationships, including cross-vocabulary queries and concept mapping. Access requires a UMLS account and applicable licensing, subject to source vocabulary restrictions.

Developer PlatformsHealth Life ScienceDrug DataScience Health PublicMedical RecordsStructured DataKnowledge Base DataData Content
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Retrieve Semantic Type Information

The /semantic-network endpoint supports the retrieval of semantic type information by identifier.

HealthcareMedicalSemanticsSample: tui, version
1 credit / call
Unknown
Latency unavailable
Retrieve Semantic Type

The /semantic-network endpoint supports the retrieval of semantic type information by identifier.

HealthcareSemanticsKnowledge Base DataSample: ui, root, version
1 credit / call
Unknown
Latency unavailable
List Ancestors for Source-Asserted Identifier

Retrieve all ancestors of a source-asserted identifier

HealthcareUmlsVocabularySample: id, source, version
1 credit / call
Unknown
Latency unavailable
List Atoms for Source-Asserted Identifier

Retrieve atoms in a source-asserted identifier

HealthcareUmlsVocabularySample: id, source, version
1 credit / call
Unknown
Latency unavailable
Retrieve Source-Asserted Attributes

Retrieves attributes of the source-asserted concept

HealthcareTerminologyUmlsSample: id, source, version
1 credit / call
Unknown
Latency unavailable
Retrieve Source-Asserted Children

Retrieves children of a source-asserted identifier, returning a list of SourceAtomCluster objects

HealthcareUmlsTerminologySample: source, version, identifier
1 credit / call
Unknown
Latency unavailable
List Descendants for Source-Asserted Identifier

Retrieve all descendants of source-asserted identifier

HealthcareUmlsVocabularySample: id, source, version
1 credit / call
Unknown
Latency unavailable
Retrieve Source-Asserted Parents

Retrieves parents of a source-asserted identifier, returning a list of SourceAtomCluster objects

HealthcareUmlsTerminologySample: source, version, identifier
1 credit / call
Unknown
Latency unavailable
Retrieve Source-Asserted Relations

Retrieves source-asserted relations for a given identifier from a specified vocabulary source in the UMLS.

HealthcareUmlsRelationsSample: version, identifier, rootSource
1 credit / call
Unknown
Latency unavailable
Retrieve Source-Asserted Identifier

Retrieves Source Concept, Source Descriptor or Code for a known source-asserted identifier (SourceAtomCluster)

HealthcareUmlsVocabularySample: id, source, version
1 credit / call
Unknown
Latency unavailable