UMLS 2014AA Release Available

The 2014AA release of the Unified Medical Language System (UMLS) Knowledge Sources is available for download as of May 12, 2014.

In the new UMLS Release there are:

• More than 2.9 million concepts and 11.6 million unique concept names from 150 source vocabularies
• The full Metathesaurus requires 22.8 GB of disk space; the active release requires 22.1 GB of disk space.
• 1 new source
  • Veterinary Extension to SNOMED CT® (SNOMEDCT_VET)
• 25 updated English sources and 19 updated translation sources including MeSH, MedDRA, RxNorm, and SNOMED CT (English and Spanish)
• SPECIALIST Lexicon and Lexical Tools 2014 Releases

Data Changes

• The Metathesaurus no longer includes the Metathesaurus CPT (Current Procedural Terminology) Hierarchical Terms source (SAB=MTHCH). The full CPT hierarchy is available within SAB=CPT as of 2014AA.

Logical Observation Identifier Names and Codes (LOINC)

• The content of the 18 LOINC subsources (such as patient assessment instruments) is now attributed to SAB=LNC, with SRL=0. As a result there are 18 fewer SABs in the Metathesaurus. Users of this content are expected to abide by the terms of the UMLS Metathesaurus License agreement as outlined in Appendix 1. The 18 SABs that no longer appear in the Metathesaurus are:
  1. LNC244_ASQ_3
  2. LNC244_BRADEN
  3. LNC244_CAM
  4. LNC244_FACIT
  5. LNC244_FLACC
  6. LNC244_MDS20
  7. LNC244_MLHFQ
  8. LNC244_NEUROQOL
  9. LNC244_NPUAP
  10. LNC244_OASIS
  11. LNC244_OPTIMAL
  12. LNC244_PHQ_9
  13. LNC244_RHO
  14. LNC244_SPERTUS
  15. LNC244_VR_12
  16. LNC244_WHO
  17. LNC242_AD8
  18. LNC242_MDS30

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 UMLS Terminology Services (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
2014 Source Release Documentation Web pages will be published following the release.