| Attribute Type | Expanded Form | Count |
| MR | Major revision date YYYYMMDD - date the Metathesaurus entry for the concept underwent any revision in content. | 3361615 |
| ST | Concept Attributes Status - valid values: R Reviewed, U Unreviewed | 3361615 |
| DA | Metathesaurus Date of entry - YYYYMMDD, e.g., 19920830 - date of entry of the concept into the Metathesaurus. | 3361615 |
| LT | Indicates 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) | 34702 |
| CV_MEMBER | Describes the membership for an atom belonging to a particular content view. The value for this attribute is a tilde-delimited microsyntax. The first field is the content view bitflag (e.g. 2048), followed by field name-value pairs describing the member. | 26752 |
| CV_CLASS | Content view class | 6 |
| CV_CONTRIBUTOR_VERSION | Version of this content view submitted by the contributor | 6 |
| CV_CODE | Content view code | 6 |
| CV_MAINTAINER_VERSION | Version of this content view submitted by the maintainer | 6 |
| CV_IS_GENERATED | Content view generated: Y/N | 6 |
| CV_MAINTAINER_URL | URL corresponding to the maintainer version of this concept view | 6 |
| CV_CATEGORY | Content view category | 6 |
| CV_CONTRIBUTOR_URL | URL corresponding to the contributor version of this concept view | 6 |
| CV_DESCRIPTION | Content view description | 6 |
| CV_MAINTAINER_DATE | Date corresponding to the maintainer version of this concept view | 6 |
| CV_CONTRIBUTOR_DATE | Date corresponding to the contributor version of this concept view | 6 |
| CV_MAINTAINER | Content view maintainer | 6 |
| CV_ALGORITHM | Content view algorithm | 6 |
| CV_CONTRIBUTOR | Content view contributor | 6 |
| FROMRSAB | Root source abbreviation for the "from" identifiers of a map set | 2 |
| MAPSETRSAB | Root source abbreviation for a map set | 2 |
| MAPSETVSAB | Versioned source abbreviation for a map set | 2 |
| FROMVSAB | Versioned source abbreviation for the "from" identifiers of a map set | 2 |
| SOS | Scope Statement | 2 |
| MTH_MAPFROMEXHAUSTIVE | Indicates whether or not the "from" source of a map set is completely mapped | 2 |
| MTH_MAPFROMCOMPLEXITY | Indicates the complexity of "from" expressions used in a map set | 2 |
| MAPSETTYPE | Indicates the nature of a map set. Its value is map set specific. It can be used to indicate the inclusion of one to one, one to many and choices of maps. | 2 |
| MTH_MAPSETCOMPLEXITY | Indicates the overall complexity of a map set | 2 |
| MTH_MAPTOEXHAUSTIVE | Indicates whether or not the "to" source is completely mapped | 2 |
| TORSAB | Root source abbreviation for the "to" identifiers of a map set | 2 |
| MAPSETSID | Source asserted identifier for a map set | 2 |
| MAPSETVERSION | Version of the map set | 2 |
| MAPSETGRAMMAR | Grammar used to describe boolean expressions used in a map set | 2 |
| TOVSAB | Versioned source abbreviation for the "to" identifiers of a map set | 2 |
| MTH_MAPTOCOMPLEXITY | Indicates the complexity of "to" expressions in a map set | 2 |
| CV_INCLUDE_OBSOLETE | Content view includes obsolete data: YN | 1 |
| CV_PREVIOUS_META | Previous UMLS Metathesaurus version used to generate content view. A null value means the content view is generated based on current UMLS Metathesaurus version. | 1 |
| Relation Name/Additional Label | Expanded Form | Count |
| RO/ | has relationship other than synonymous, narrower, or broader/Empty relationship attribute | 672532 |
| RN/ | has a narrower relationship/Empty relationship attribute | 223995 |
| RB/ | has a broader relationship/Empty relationship attribute | 223995 |
| SY/ | source asserted synonymy./Empty relationship attribute | 81358 |
| RO/exhibits | has relationship other than synonymous, narrower, or broader/Exhibits | 1293 |
| RO/exhibited_by | has relationship other than synonymous, narrower, or broader/Exhibited by | 1293 |
| RO/measured_by | has relationship other than synonymous, narrower, or broader/Measured by | 219 |
| RO/measures | has relationship other than synonymous, narrower, or broader/Measures | 219 |
| RN/form_of | has a narrower relationship/Form of | 1 |
| RB/has_form | has a broader relationship/Has form | 1 |
