Unified Medical Language System (UMLS)

2008AA UMLS files available for download from the UMLSKS. ••• The UMLSKS v6.0 is now live here ••• 2/4/08 SNOMED CT January 31, 2008 International Release available for download from the UMLSKS. ••• New to the UMLS? Register now.

	About the UMLS Resources
	Metathesaurus; Semantic Network; SPECIALIST Lexicon and lexical tools; MetamorphoSys

	Accessing UMLS Knowledge Sources
	Metathesaurus license; Semantic Network; SPECIALIST Lexicon; DVD

	Knowledge Source Server
	Download files; search and browse; additional tools and resources • New UMLS Knowledge Source Server (UMLSKS) version 6.0 (beta) • UMLS Knowledge Source Server (UMLSKS) version 5.0

	Documentation

	Help
	Training; contact us; FAQs; listserv

• SNOMED CT
• LOINC
• RxNorm
• MeSH
• List of Sources
• Source FAQs
• Mappings

new New Users' Guide to the UMLS
• UMLS Community
• Webcasts
• Metathesaurus License
• Tools
• Learning Resources
• MetaMap Transfer (MMTx)
• Archives

• Coming UMLS Releases

The NLM Unified Medical Language System (UMLS) project develops and distributes multi-purpose, electronic "Knowledge Sources" and associated lexical tools for system developers. Researchers will find the UMLS products useful in investigating knowledge representation and retrieval questions.

Last reviewed: 05 May 2008
Last updated: 05 May 2008
First published: 01 January 1999
Metadata| Permanence level: Permanence Not Guaranteed