2012AB MedDRA Source Information

Counts

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Term Type	Description	Count (MRCONSO.RRF)
LT	Lower Level Term	61091
PT	Designated preferred name	19550
OL	Non-current Lower Level Term	9086
HT	Hierarchical term	1713
MTH_LT	MTH Lower Level Term	593
HG	High Level Group Term	335
MTH_PT	Metathesaurus preferred term	223
MTH_HT	MTH Hierarchical term	205
SMQ	Standardised MedDRA Query	203
MTH_OL	MTH Non-current Lower Level Term	136
MTH_HG	MTH High Level Group Term	63
MTH_SMQ	Metathesaurus version of Standardised MedDRA Query	57
AB	Abbreviation in any source vocabulary	26
OS	System-organ class	26
MTH_OS	MTH System-organ class	1

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