retrospective delta view

A delta view for a specified date range.

Notes

• Delta views allow changes to the terminology content to be reviewed.

• A retrospective delta view is generated by filtering a full view so that it only contains rows with effectiveTime "Reference term: effectiveTime (field)") values between two specified dates.

Provide Feedback

release format

This is an abbreviation for SNOMED CT release format.

SNOMED CT release format

A file structure used to distribute SNOMED CT content.

Notes

• The release format is specified by SNOMED International.

• The current release format is Release Format 2, which superseded Release Format 1 in 2012.

Alternatives

• Release format

• SNOMED CT distribution format

record service

A software function that captures, stores, retrieves, displays, communicates or processes electronic health records.

Notes

• Record service are typically specific to the design of a specific clinical information system as this affect the nature of the services required to capture, store, retrieve, display and process records._ _

• Record services interact with terminology services to support capture, retrieval and processing of SNOMED CT encoded data.

Related

• Terminology service

relationship type

This is a synonym for attribute name.

attribute name

The concept that represents the attribute type in a defining relationship or postcoordinated expression.

Notes

• An attribute name with an attribute value is referred to as an attribute value pair.

• An attribute value pair can represent a defining characteristic of a concept or an expression refinement.

• In the relationship file , the attribute name is represented by the relationship.typeId and the attribute value by the relationship.destinationId._ _

• Theconcepts that can be used to name attributes are:

1. • subtypes of

• Relationship type

release file column

This is a synonym for release file field.

release file field

A property of a SNOMED CT component or reference set member represented by a column in a release file.

Alternatives

• Field

• Release file column

Provide Feedback

reference set

This is an abbreviation for SNOMED CT reference set.

SNOMED CT reference set

A standard format for maintaining and distributing a set of references to SNOMED CT components.

Notes

• A reference set can be used to represent a subset of components (concepts, descriptions or relationships).

• A reference set may also associate referenced components with additional information such as:

  • Ordered lists of components

  • Sets of associations between components

  • Mapping between SNOMED CT concepts and other systems codes, classifications, or knowledge resources.

• Refset

RF1

This is an abbreviation for SNOMED CT Release Format 1.

SNOMED CT Release Format 1

The file structure previously used to distribute SNOMED CT content.

Notes

• Release Format 1 was specified by SNOMED International in 2002, but was replaced by Release Format 2 in January 2012.

• Release Format 2 is now the primary format for the SNOMED CT International Release.

• During an overlap period until 2016, both formats were used for the SNOMED CT International Release.

• RF1

• Release Format 1

This is an abbreviation for SNOMED CT Release Format 2.

The file structure used to distribute SNOMED CT content and derivatives.

• Release Format 2 was specified by SNOMED International.

• In 2012, Release Format 2 replaced the original SNOMED CT Release Format 1 used between 2002 and 2012.

• During an overlap period until 2016, both formats were used for the SNOMED CT International Release.

reference set membership test

A test to determine whether a specified SNOMED CT component is a member of a specified reference set.

Notes

• A component is a member of a reference set if at least one active row in that reference set has a referenceComponentId "Reference term: referenceComponentId (field)") that matches the __ identifier of that component. Otherwise, a component is not a member of that reference set.

• Reference set membership tests may be used to filter searches or as part of a expression constraint or query.

• In an expression constraint a reference set membership test is represented by the symbol** ^** followed by a concept id identifying the reference set.

release package

This is an abbreviation for SNOMED CT release package.

SNOMED CT release package

A single-unit set of release files with SNOMED CT components, reference set members, and/or other related items.

Notes

• A release package

  • Is distributed by SNOMED International, a National Release Center, or another organization authorized to maintain and distribute a SNOMED CT extension

  • May be a complete SNOMED CT Edition or a supplementary extension module, dependent on other modules

  • May be referred to as a release package version, meaning it is distributed at a specific point in time

    • Each release package version is assigned a release packages status: alpha release package, beta release package, or production release package.

  • May also refer to other SNOMED CT products or services, such as those listed in the

• Release

• Release package

refset

This is an abbreviation for SNOMED CT reference set.

SNOMED CT reference set

A standard format for maintaining and distributing a set of references to SNOMED CT components.

Notes

• A reference set can be used to represent a subset of components (concepts, descriptions or relationships).

• A reference set may also associate referenced components with additional information such as:

  • Ordered lists of components

  • Sets of associations between components

  • Mapping between SNOMED CT concepts and other systems codes, classifications, or knowledge resources.

• Refset

This is an abbreviation for expression refinement.

The part of a SNOMED CT expression that applies qualifying details to a focus concept.

• A spiral fracture of the shaft of humerus can be represented by an expression in which the concept fracture of humerus is made more specific by the addition of a refinements containing attributes that more precisely indicate the location and morphology.

: ⬅︎ Focus concept { = , ⬅︎ Refinement = } ⬅︎ ...

reference set member

A row in a reference set release file with a unique identifier.

Notes

• Although each reference set member has a unique identifier , a full view of a reference set may contain several versions of each reference set member with the same identifier. The effectiveTime and active fields represent the version and status of the reference set member .

• Each reference set member belongs to a __reference set which is identified by the refsetId field "Reference term: refsetId (field)").

• All reference set members also contain a referencedComponentId field "Reference term: referencedComponentId (field)") referring to a SNOMED CT component that is part of the set.

• Reference set members may have other fields, depending on the type of reference set.

relationship group

This is used to refer to a group of relationships representing an attribute group.

attribute group

An association between a set of attribute value pairs that causes them to be considered together within a concept definition or postcoordinated expression.

Notes

• When an attribute group is represented as a group of defining relationships it is usually referred to as a relationship group.

Example

• | Cholecystectomy with exploration of common duct| has two different attribute groups:

  • is grouped with

  • is grouped with

• If these attributes were not grouped, this procedure would incorrectly classified as a subtype of .

• Relationship group

• Role group

• Relationship Group

role group

This is a synonym for relationship group.

relationship group

This is used to refer to a group of relationships representing an attribute group.

attribute group

An association between a set of attribute value pairs that causes them to be considered together within a concept definition or postcoordinated expression.

Notes

• When an attribute group is represented as a group of defining relationships it is usually referred to as a relationship group.

Example

• | Cholecystectomy with exploration of common duct| has two different attribute groups:

  • is grouped with

  • is grouped with

• If these attributes were not grouped, this procedure would incorrectly classified as a subtype of .

• Relationship group

• Role group

relationship

This is an abbreviation for SNOMED CT relationship.

SNOMED CT relationship

An association between a source concept and a destination concept.

Notes

• Each relationship is represented by a separate row in the relationship file.

• Each relationship has a unique identifier and contains columns identifying the relationship type and the concepts that are related (sourceId "Reference term: sourceId (field)") and destinationId "Reference term: destinationId (field)")).

• Each relationship provides defining information about the source concept.

• Since July 2019, OWL axioms the authoritative representation of the stated view of concept definitions are represented by axioms distributed in OWL Expression Reference Sets. Relationships continue to be distributed to represent necessary normal form of the inferred view concept definitions.

• The source, type and destination of one of the relationships for the concept are as follows:

• Relationship

reference set member version

A reference set member as created or modified at a particular point in time.

Notes

• A reference set member version is represented in release files as a single row with an identifier, unique to that reference set member.

• The identifier is shared by other versions of that reference set member as indicated by the effectiveTime and active fields.

  • The effectiveTime field indicates the point in time at which this version of the reference set member was created or superseded the previous version of the same reference set member.

  • The active field indicates if the reference set member is active or inactive.

• Reference set

• Reference set member

• Reference Sets Practical Guide

• Release FIle Specification - Reference Set Types

release

This is an abbreviation for SNOMED CT Release Package.

SNOMED CT Release Package

A single-unit set of release files with SNOMED CT components, reference set members, and/or other related items.

Notes

• A release package

  • Is distributed by SNOMED International, a National Release Center, or another organization authorized to maintain and distribute a SNOMED CT extension

  • May be a complete SNOMED CT Edition or a supplementary extension module, dependent on other modules

  • May be referred to as a release package version, meaning it is distributed at a specific point in time

    • Each release package version is assigned a release packages status: alpha release package, beta release package, or production release package.

  • May also refer to other SNOMED CT products or services, such as those listed in the

• Release

• Release package

Release Format 1

This is an abbreviation for SNOMED CT Release Format 1.

SNOMED CT Release Format 1

The file structure previously used to distribute SNOMED CT content.

Notes

• Release Format 1 was specified by SNOMED International in 2002, but was replaced by Release Format 2 in January 2012.

• Release Format 2 is now the primary format for the SNOMED CT International Release.

• During an overlap period until 2016, both formats were used for the SNOMED CT International Release.

• RF1

• Release Format 1

release type

The temporal scope and completeness of a SNOMED CT release file or release package.

Notes

• The release types are as follows:

  • Full release

    • A release type in which the release files contain every version of every component and reference set member ever released.

  • Snapshot release

    • A release type in which the release files contain only the most recent version of every component and reference set member released, as at the release date.

  • Delta release

    • A release type in which the release files contain only rows that represent component versions and reference set member versions created since the previous release date.

range

This is an abbreviation for concept model range.

concept model range

A set of values that the concept model permits to be applied to a specific attribute.

Notes

• The range of permitted values that can be applied to an attribute is formally specified using the expression constraint language.

• The range is typically limited to concepts that are subtypes of one concept. However, in some cases a range may be specified to include subtypes of several concepts or members of a specified reference set.

Example

• The concept model range for the attribute is limited the concept and its subtypes. This is specified by the following constraint:

<<

• Range

A five-character code allocated to a concept or term in NHS Clinical Terms Version 3 or Read Codes Version 2.

• Codes originating in the Read Codes 4 byte set may be prefixed with a full stop to represent them in five-character coded form.

The authority, expertise, or preference that influences the required range or frequency of use of components.

• A realm may be a county, organization, professional discipline, specialty, or individual user.

The concept that is at the top of the SNOMED CT concept hierarchy.

• The root concept is .

• All other active concepts are subtype descendants of the root concept.

role

This is a synonym for concept model attribute.

concept model attribute

A characteristic of the meaning of a concept or the nature of a refinement.

Notes

• An attribute is assigned a value (attribute value pair) when used in the definition of a concept or in a postcoordinated expression.

• The attributes that can be used in definitions or refinements are represented by a concepts that are subtypes of the concept 410662002 | Concept model attribute (attribute)| .

• The SNOMED CT concept model specifies:

  • The concept model domains which each specific attribute can be applied; and

  • The concept model range of values that can be applied to each specific attribute.

• The attribute

  • is one of the attributes that can be applied to concepts in the domain; and

  • its range includes and its subtypes.

• Attribute

• Role

This is a synonym for Read Code.

A five-character code allocated to a concept or term in NHS Clinical Terms Version 3 or Read Codes Version 2.

• Codes originating in the Read Codes 4 byte set may be prefixed with a full stop to represent them in five-character coded form.

Release Format 2

This is an abbreviation for SNOMED CT Release Format 2.

SNOMED CT Release Format 2

The file structure used to distribute SNOMED CT content and derivatives.

Notes

• Release Format 2 was specified by SNOMED International.

• In 2012, Release Format 2 replaced the original SNOMED CT Release Format 1 used between 2002 and 2012.

• During an overlap period until 2016, both formats were used for the SNOMED CT International Release.

• Release Format 2

• RF2

release file

This is an abbreviation for SNOMED CT release file.

SNOMED CT release file

A computer file used to distribute SNOMED CT content in a form that can be readily imported by a software application.

Notes

• The content is from SNOMED International or from the originator of an Extension._ _

• SNOMED CT release files follow the Release Format 2 (RF2) as defined in the SNOMED CT Release File Specifications.

Alternatives

• Release file

• SNOMED CT distribution file

A terminology in which each term has a formal computer-processable definition of its meaning.

• Reference terminologies support __ meaning-based retrieval and aggregation.

• SNOMED CT is a reference terminology, which also has features such as synonyms and reference sets that support use at the user interface.

This is a synonym for Read Code.

A five-character code allocated to a concept or term in NHS Clinical Terms Version 3 or Read Codes Version 2.

• Codes originating in the Read Codes 4 byte set may be prefixed with a full stop to represent them in five-character coded form.

A high-level, generalized model that allows information to be represented and related consistently within a particular field of human endeavor.

• The Health Level 7 Version 3 Reference Information Model is an example of a reference information model used in health care.

root metadata concept

This is a synonym for SNOMED CT model component concept.

SNOMED CT model component concept

The concept that represents the top of the hierarchy of metadata concepts.

Notes

• This SNOMED CT model component concept has the identifier 900000000000441003 | SNOMED CT Model Component (metadata)| .

• The top level of the metadata hierarchy represents broad groups of metadata as follows:

138875005 |SNOMED CT Concept| ⬅︎ The root concept 900000000000441003 |SNOMED CT Model Component| ⬅︎ The root metadata concept 106237007 |Linkage concept| ⬅︎ Attributes and other linkage concepts 370136006 |Namespace concept| ⬅︎ Concepts representing namespaces 900000000000442005 |Core metadata concept| ⬅︎ Metadata supporting components 900000000000454005 |Foundation metadata concept| ⬅︎ Metadata supporting refsets

• Root metadata code

A snapshot view for a specified snapshot date.

• A snapshot view is generated by filtering a full view so that it only includes the most recent version of each SNOMED CT component as at a specified date.

• Access to a current snapshot view is essential for data entry. However, it is also useful to be able to set alternative snapshot dates for some types of analysis. For example, to determine whether current and previous results of similar queries have been affected by more recent enhancements to the terminology.

A property of a SNOMED CT component or reference set member represented by a column in a release file.

• Field

• Release file column

• SNOMED CT Release File Specifications

A set of one or more rules that define the concept model range for a specific attribute.

• Range constraints are specified using expression constraint language.

• A concept model range is a set of values that the concept model permits to be applied to a specific attribute.

.

Read Code Version 3

This is a synonym for NHS Clinical Terms Version 3.

NHS Clinical Terms Version 3

A source terminology used to develop SNOMED CT.

Notes

• SNOMED RT was also used with NHS Clinical Terms Version 3 to develop SNOMED CT .

• NHS Clinical Terms Version 3 is UK Crown Copyright, distributed by the United Kingdom National Health Service (NHS), and is integrated into SNOMED CT.

Alternatives

• CTV3

• Read Codes Version 3