2008AB MeSH Source Information

Counts

Attribute Name	Description	Count (MRSAT.RRF)
TERMUI	Term unique identifier	641127
HM	MeSH Heading Mapped To - heading mapped to attribute in C-MeSH containing repeating (MH or MH/SH) elements (e.g. HM = PYRROLIDINONES, HM = *TARTRATES, HM = ESTRONE/* analogs & derivatives)	250554
RN	Registry Number - series of numbers and hyphens (any leading zeros in an RN are dropped) or a series of numbers and periods, preceded by EC	223788
MDA	MeSH date of entry YYYYMMDD - date the term was added to the MeSH file, which is prior to the date the term became available for indexing and searching MEDLARS citations. Terms that have been part of MeSH for many years may have no value in this element.	204459
SRC	MeSH Literature source of chemical name - a citation to an article in a journal indexed for MEDLINE in which the chemical has been identified. (Note: Not to be confused with source abbreviation of SRC)	187647
FR	MeSH Frequency	179190
SOS	Scope Statement	154618
MMR	MeSH revision date YYYYMMDD - date of the last major revision to the term's MeSH record.	148085
TH	MeSH Thesaurus ID - identifies thesauri other than MeSH in which the MeSH heading or cross-reference is included.	120624
MN	MeSH hierarchical number for the concept in the MeSH tree structures. This number also appears in the HCD subelement of the REL and CXT elements.	49811
PI	MeSH heading or heading/subheading combination(s) followed by a date range in parentheses (YYYY).	45746
II	MeSH Indexing Information - for MeSH chemical terms (Term Type=NM), MeSH headings that may be relevant to articles that are also assigned the NM term.	38872
DC	MeSH Descriptor class - type of MeSH term the concept name represents.	25186
AQL	MeSH Allowable Qualifier - list of allowable qualifier abbreviations for MeSH main headings (e.g. AA, CL, CS, DF, DU, IM, I,P ME, PK)	24192
RR	The Chemical Abstracts Registry numbers for salts, optical isomers, or isotope-labeled versions of the concept followed by the relationship of this RR to the RN (in parentheses.) Applies to chemicals only. These numbers can be used as links to information in a number of chemical and toxicological databases.	23177
HN	History Note - for MeSH history notes, the year when the current form of the MeSH term was established as a major and/or minor descriptor.	21174
PM	Public MeSH note - combines key information from the HN and PI elements in a format that is printed in the MeSH publications.	20740
DX	MeSH Date major descriptor established YYYYMMDD - first day of the Index Medicus publication month in which the descriptor (in any form) was available for searching as a major descriptor.	19960
AN	MeSH Annotation - an informative MeSH note written primarily for indexers or catalogers that may also be useful in explaining the use of a MeSH term to online searchers.	15424
PA	Pharmacologic Action of MeSH main headings (MH) for drugs and supplementary concept names (NM). The information in this element is also represented by an "isa" relationship between the MH or NM concept and the MeSH concept name for the class of drugs with a particular pharmacologic action.	10480
FX	MeSH MH Mapping - maps a MeSH MH to a 'See Related' MH.	6657
OL	MeSH Online Note - information helpful to online searchers of MEDLINE, especially when the history of a term or cross-reference has implications for online searching. This is a potential source of useful information for rules for search interface programs.	3344
EC_OF	MeSH Entry combination OF - an invalid MeSH main heading/subheading combination that is a cross reference to a single MeSH main heading or a main heading/subheading combination that should be used in its place. Has a format of SDUI/Qualifier	730
EC	MeSH Entry combination - an invalid MeSH main heading/subheading combination that is a cross reference to a single MeSH main heading or a main heading/subheading combination that should be used in its place.	699
DQ	MeSH Date Qualifier Established YYYYMMDD - date the qualifier became available for indexing MEDLARS citations.	83
QA	MeSH Topical Qualifier Abbreviation - for MeSH subheadings (Term Type=TQ), an abbreviation that may be used in place of the full text of the abbreviation in searching on NLM's system and possibly on other systems offering NLM data.	83
CX	MeSH Consider Also Note - other word roots or prefixes that should be consulted for concepts related to this MeSH concept, e.g., the value for "Heart" is "consider also terms at cardi- and myocardi-".	66

Background

• Each attribute in each source is assigned an Attribute Name (ATN) based on source documentation or NLMs understanding of the source.
• Samples below are taken from MRSAT.RRF, although not every field is shown. Associated terms (str) from MRCONSO.RRF are also shown for clarity.
• Sample data highlight examples of ATNs and Attribute Values (ATV) in MRSAT.RRF.
• ATN abbreviations are contained in MRSAT, i.e., DID.
• The corresponding ATVs, i.e., Descriptor Identifier, are listed in Appendix B.2 at http://www.nlm.nih.gov/research/umls/metab2.html#sb2_0.
• See Section 2.7.1.3.5 in UMLS Documentation Section 2, Metathesaurusfor more information on MRSAT.RRF.

Sample Data