2012AB MeSH Source Information

Counts

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Term Type	Description	Count (MRCONSO.RRF)
CE	Entry term for a Supplementary Concept	241442
NM	Name of Supplementary Concept	209326
PM	Machine permutation	105698
PCE	Preferred entry term for Supplementary Concept	68757
EN	Non-print entry term	38707
MH	Main heading	26853
N1	Chemical Abstracts Service Type 1 name of a chemical	22401
EP	Print entry term	18436
PEN	Preferred non-print entry term	16932
DEV	Descriptor entry version	16260
PEP	Preferred entry term	7188
DSV	Descriptor sort version	3929
PXQ	Preferred qualifier term	168
QAB	Qualifier abbreviation	83
QEV	Qualifier entry version	83
TQ	Topical qualifier	83
XQ	Alternate name for a qualifier	67
HT	Hierarchical term	22
QSV	Qualifier sort version	7
HS	Short or alternate version of hierarchical term	4

Notes

• A term type indicates the role an atom plays in its source
• An atom is the smallest unit of naming in a source; that is, a specific string with specific code values and identifiers from a specific source.
• Every atom has a separate row in MRCONSO.RRF. Every atom is assigned a term type.
• Term types are assigned based on source documentation or NLM understanding of the source.
• Sample data are provided for every term type in the source (see below).
• See Metathesaurus Documentation for a list of all term type abbreviations and their full names.
• See Metathesaurus Documentation for a list of sources and their associated term types, listed in default order of precedence.
• See Section 2.3 of the UMLS Reference Manual for more information on terms and term types in the UMLS Metathesaurus.

Sample Data