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UMLS API Technical Documentation


Current REST API Version: 0.63 beta

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Retrieving UMLS Concept Definitions

URIs | Query Parameters | Sample Output

URIs with /definitions support the following use cases:

  • Retrieve the source-asserted definitions for a known CUI.

Note that ‘current’ in the URI can always be used to search against the latest UMLS publication.
You may use any valid UMLS release back to 2008AA in your URI if you would like to search against a particular version of the UMLS.

URIs

The base URI is https://uts-ws.nlm.nih.gov/rest

Sample URI Description Returned JSON Object classType
/content/current/CUI/C0155502/definitions Retrieves definitions of the CUI Definition

Query Parameters

Parameter name Required? Y/N Description Valid Values Default value Usage Note
ticket Y A single-use service ticket is required for each call to the API. See authentication for more information n/a n/a n/a
sabs N One or more source abbreviations Any root source abbreviation in the UMLS n/a Use a comma between each source abbreviation to specify more than one.
pageNumber N Whole number that specifies which page of results to fetch. 1,2,3, etc 1 n/a
pageSize N Whole number that specifies the number of results to include per page. 1,2,3, etc 25 n/a

Sample Output

Sample output for https://uts-ws.nlm.nih.gov/rest/content/current/CUI/C0155502/definitions?ticket=ST…

{
    "pageSize": 25,
    "pageNumber": 1,
    "pageCount": 1,
    "result": [
        {
            "classType": "Definition",
            "sourceOriginated": true,
            "rootSource": "MSH",
            "value": "Idiopathic recurrent VERTIGO associated with POSITIONAL NYSTAGMUS. It is associated with a vestibular loss without other neurological or auditory signs. Unlike in LABYRINTHITIS and VESTIBULAR NEURONITIS inflammation in the ear is not observed."
        }
    ]
}