LO produces and maintains the Medical Subject Headings (MeSH), a subject thesaurus used by NLM and many other institutions to describe the subject content of biomedical literature and other types of information; develops, supports, or licenses for US use vocabularies designed for use in electronic health records and clinical decision support systems; and works with the Office of Computer and Communications Systems (OCCS) and Lister Hill Center (LHC) to produce the Unified Medical Language System (UMLS) Metathesaurus, a large vocabulary database that includes many vocabularies, including MeSH and several others developed or supported by NLM. The Metathesaurus is.
