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Unified Medical Language System (UMLS)

UMLS Vocabularies

MSH (MeSH) - Statistics


Semantic Type Distribution

Semantic Type IDSemantic Type NameCount Percentage Distribution
T109Organic Chemical19145432.2
T116Amino Acid, Peptide, or Protein12079920.3
T121Pharmacologic Substance9402015.8
T123Biologically Active Substance6797811.4
T126Enzyme279004.7
T047Disease or Syndrome114221.9
T114Nucleic Acid, Nucleoside, or Nucleotide99931.7
T130Indicator, Reagent, or Diagnostic Aid77081.3
T129Immunologic Factor67791.1

Term Type Counts

Term TypeExpanded FormCount
CEEntry term for a Supplementary Concept272296
NMName of Supplementary Concept248038
PMMachine permutation119027
PCEPreferred entry term for Supplementary Concept72708
ETEntry term62307
MHMain heading29351
PEPPreferred entry term27895
N1Chemical Abstracts Service Type 1 name of a chemical23016
DEVDescriptor entry version16149
DSVDescriptor sort version3924
PXQPreferred qualifier term161
QEVQualifier entry version78
QABQualifier abbreviation78
TQTopical qualifier76
XQAlternate name for a qualifier69
HTHierarchical term22
QSVQualifier sort version7
HSShort or alternate version of hierarchical term4

Attribute Counts

Attribute TypeExpanded FormCount
TERMUITerm unique identifier831928
THMeSH Thesaurus ID - identifies thesauri other than MeSH in which the MeSH heading or cross-reference is included.756990
HMMeSH 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)354390
RNRegistry Number - series of numbers and hyphens (any leading zeros in an RN are dropped) or a series of numbers and periods, preceded by EC300535
MDAMeSH 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.277465
FRMeSH Frequency248038
SCMeSH Supplemental record class.248038
SRCMeSH 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)246808
SOSScope Statement209768
MMRMeSH revision date YYYYMMDD - date of the last major revision to the term's MeSH record.199360
MNMeSH hierarchical number for the concept in the MeSH tree structures. This number also appears in the HCD subelement of the REL and CXT elements.59835
PIMeSH heading or heading/subheading combination(s) followed by a date range in parentheses (YYYY).50878
IIMeSH Indexing Information - for MeSH chemical terms (Term Type=NM), MeSH headings that may be relevant to articles that are also assigned the NM term.44945
RRThe 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.38966
DCMeSH Descriptor class - type of MeSH term the concept name represents.29351
DXMeSH 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.29351
AQLMeSH Allowable Qualifier - list of allowable qualifier abbreviations for MeSH main headings (e.g. AA, CL, CS, DF, DU, IM, I,P ME, PK)28224
HNHistory Note - for MeSH history notes, the year when the current form of the MeSH term was established as a major and/or minor descriptor.25396
PMPublic MeSH note - combines key information from the HN and PI elements in a format that is printed in the MeSH publications.24889
LTIndicates if a chemicals or medical device is a tradename (present in older versions of the Metathesaurus and was discontinued, then brought back starting in 2002AD)15433
PAPharmacologic 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.14282
ANMeSH 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.12567
FXMeSH MH Mapping - maps a MeSH MH to a 'See Related' MH.8793
OLMeSH 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.3079
ECSpecifies the MeSH main heading to be used instead of the Descriptor/Qualifier combination specified in the EC_OF attribute.974
DQMeSH Date Qualifier Established YYYYMMDD - date the qualifier became available for indexing MEDLARS citations.76
CXMeSH 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

Relationship Counts

Relation Name/Additional LabelExpanded FormCount
QB/can be qualified by./Empty relationship attribute602217
AQ/Allowed qualifier/Empty relationship attribute602217
SIB/has sibling relationship in a Metathesaurus source vocabulary./Empty relationship attribute465932
RB/mapped_fromhas a broader relationship/Mapped from354390
RN/mapped_tohas a narrower relationship/Mapped to354390
SY/has_permuted_termsource asserted synonymy./Has permuted term119027
SY/permuted_term_ofsource asserted synonymy./Permuted term of119027
RB/has a broader relationship/Empty relationship attribute93546
RN/has a narrower relationship/Empty relationship attribute93546
CHD/has child relationship in a Metathesaurus source vocabulary /Empty relationship attribute40015
PAR/has parent relationship in a Metathesaurus source vocabulary /Empty relationship attribute40015
RO/mapping_qualifier_ofhas relationship other than synonymous, narrower, or broader/Mapping qualifier of34904
RO/has_mapping_qualifierhas relationship other than synonymous, narrower, or broader/Has mapping qualifier34904
RO/has relationship other than synonymous, narrower, or broader/Empty relationship attribute27378
SY/entry_version_ofsource asserted synonymy./Entry version of16227
SY/has_entry_versionsource asserted synonymy./Has entry version16227
RN/isahas a narrower relationship/Is a14282
RB/inverse_isahas a broader relationship/Inverse is a14282
SY/has_sort_versionsource asserted synonymy./Has sort version3931
SY/sort_version_ofsource asserted synonymy./Sort version of3931
SY/has_expanded_formsource asserted synonymy./Has expanded form78
SY/expanded_form_ofsource asserted synonymy./Expanded form of78

Definition Count

Count
31415

Source Overlap

Source# Concepts Sharing Atom/# Total ConceptsPercentage Distribution
MSHFRE47145/37814312.5
MSHGER43696/37814311.6
MSHCZE43580/37814311.5
MSHPOR40853/37814310.8
MSHSPA40600/37814310.7
MSHITA39820/37814310.5
MSHNOR33847/3781439.0
SNOMEDCT_US30542/3781438.1
SCTSPA29935/3781437.9
MSHPOL29354/3781437.8
MSHRUS29357/3781437.8
MSHSWE29012/3781437.7
NCI29253/3781437.7
MSHJPN24861/3781436.6
MSHFIN24695/3781436.5
CHV24267/3781436.4
MSHDUT20635/3781435.5
SNMI19691/3781435.2
NDFRT16479/3781434.4
RCD15837/3781434.2
CSP10732/3781432.8
SNM10275/3781432.7
LCH_NW10349/3781432.7
MEDCIN9307/3781432.5
NCI_FDA9424/3781432.5
RXNORM9094/3781432.4
MSHSCR9143/3781432.4
OMIM8005/3781432.1
AOD7228/3781431.9
LNC6721/3781431.8
MDRJPN6746/3781431.8
MDR6759/3781431.8
MDRCZE6759/3781431.8
MDRDUT6759/3781431.8
MDRFRE6759/3781431.8
MDRGER6759/3781431.8
MDRHUN6759/3781431.8
MDRITA6759/3781431.8
MDRPOR6759/3781431.8
MDRSPA6759/3781431.8
MMSL5893/3781431.6
NCBI5991/3781431.6
PDQ6064/3781431.6
NDDF6065/3781431.6
LCH5626/3781431.5
DRUGBANK5238/3781431.4
MTHSPL4484/3781431.2
NCI_CTRP4609/3781431.2
ICPC2ICD10ENG4269/3781431.1