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Table of Contents: 2015 NOVEMBER–DECEMBER No. 407

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UMLS 2015AB Release Available

Wilder V. UMLS 2015AB Release Available. NLM Tech Bull. 2015 Nov-Dec;(407):e5.

2015 November 13 [posted]

The 2015AB release of the Unified Medical Language System (UMLS) Knowledge Sources is available for download as of November 10, 2015.

In the new UMLS Release there are:

  • More than 3.2 million concepts and 12.8 million unique concept names from over 190 source vocabularies
  • The full Metathesaurus requires 25 GB of disk space; the active release requires 24 GB of disk space.
  • New NCI subsource
    • NCI_CareLex (Content Archive Resource Exchange Lexicon)
  • 2 new sources
    • HPO (Human Phenotype Ontology)
    • MVX (Manufacturers of Vaccines)
  • 19 new LOINC (LNC) translation sources
    • LNC-DE-CH_252 (German, Switzerland Edition)
    • LNC-DE-DE_252 (German, Germany Edition)
    • LNC-EL-GR_252 (Greek, Greece Edition)
    • LNC-ES-AR_252 (Spanish, Argentina Edition)
    • LNC-ES-CH_252 (Spanish, Switzerland Edition)
    • LNC-ES-ES_252 (Spanish, Spain Edition)
    • LNC-ET-EE_252 (Estonian, Estonia Edition)
    • LNC-FR-BE_252 (French, Belgium Edition)
    • LNC-FR-CA_252 (French, Canada Edition)
    • LNC-FR-CH_252 (French, Switzerland Edition)
    • LNC-FR-FR_252 (French, France Edition)
    • LNC-IT-CH_252 (Italian, Switzerland Edition)
    • LNC-IT-IT_252 (Italian, Italy Edition)
    • LNC-KO-KR_252 (Korean, Korea Edition)
    • LNC-NL-NL_252 (Dutch, Netherlands Edition)
    • LNC-PT-BR_252 (Portuguese, Brazil Edition)
    • LNC-RU-RU_252 (Russian, Russia Edition)
    • LNC-TR-TR_252 (Turkish, Turkey Edition)
    • LNC-ZH-CN_252 (Chinese, China Edition)
  • 50 updated English sources and 11 updated translation sources including MeSH, MedDRA, RxNorm, and SNOMED CT (English and Spanish)


  • As of 2015AB, MTHFDA no longer appears in the Metathesaurus.

Release Information
For more information about the release, see the What's New and Updated Sources sections of the Release Documentation. Additional release statistics are published on the UMLS Web site.

To access the UMLS Release files, you must have an active UMLS Metathesaurus License and a valid UTS account. You will be prompted for your UTS username and password when downloading the files.

Additional information regarding the UMLS is available on the UMLS homepage. New users are encouraged to take the UMLS Basics Tutorial and to explore the new UMLS Quick Start Guide, training materials and other information on the New Users' homepage.

Source Release Documentation
2015AB Source Release Documentation Web pages will be published following the release.

By Victoria Wilder
MEDLARS Management Section

NLM Technical Bulletin National Library of Medicine National Institutes of Health