Table 2.
UMLS vocabularies used in this study.
| Vocabulary | No. of terms | Official name |
|---|---|---|
| AOD | 20,685 | Alcohol and Other Drug Thesaurus |
| CHV | 146,324 | Consumer Health Vocabulary |
| DXP | 10,113 | DXplain (an expert diagnosis program) |
| MSH | 815,608 | Medical Subject Headings |
| MTH | 171,407 | UMLS Metathesaurus |
| MTHFDA | 86,069 | Metathesaurus FDA National Drug Code Directory |
| MTHSPL | 113,248 | Metathesaurus FDA Structured Product Labels |
| NCBI | 1,265,703 | National Center for Biotechnology Information Taxonomy |
| NCI | 255,108 | National Cancer Institute Thesaurus |
| RXNORM | 628,521 | RxNorm Vocabulary |
| SNM | 44,274 | Systemized Nomenclature of Medicine |
| SNMI | 164,179 | Systemized Nomenclature of Human and Veterinary Medicine |
| SNOMEDCT_US | 1,225,189 | Systemized Nomenclature of Medicine—Clinical Terms (U.S. Edition) |
| SNOMEDCT_VET | 89,572 | Veterinary Extension to SNOMED-CT |
| SRC | 1,018 | Metathesaurus Source Terminology Names |
| A vocabulary is a curated list of terms that represent the important concepts of a particular field. The number of terms in each vocabulary gives its relative contribution to the UMLS installation. | ||