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An

glossary-ref
Gloss
tExtension
mechanism offers many advantages to developers, vendors, terminologists, national bodies and users.

Such a mechanism allows:

  • Users to access the glossary-ref
    Gloss
    tSNOMED
    CT
    International
    Release
    and one or more glossary-ref
    Gloss
    tExtensions
    through a single glossary-ref
    Gloss
    tuser
    interface
    ;
  • Developers to implement
    Glossary ref
    SNOMED CT
    Glossary ref
    Gloss
    Spacetrue
    tSNOMED CT
    Gloss
    tExtensions
    without developing specialized software;
  • Vendors to develop and sell products to take advantage of both glossary-ref
    Gloss
    tInternational
    Release
    content and glossary-ref
    Gloss
    tExtensions
    ;
  • Organizations to develop and share terminology that meet their business needs, without procuring software;
  • Glossary refIHTSDO
    Gloss
    tSNOMED International Affiliates
    to develop terminology that can be shared with other organizations and considered for addition to the glossary-ref
    Gloss
    tInternational
    Release
    content;
  • Glossary refIHTSDO
    Gloss
    tSNOMED International Affiliates
    to use locally-developed terminology without potential overlap with the work of other organizations.

This structure also enables specialized

glossary-ref
Gloss
tConcepts
and glossary-ref
Gloss
tDescriptions
within an glossary-ref
Gloss
tExtension
to be related to glossary-ref
Gloss
tConcepts
and glossary-ref
Gloss
tDescriptions
distributed as part of glossary-ref
Gloss
tSNOMED
CT
.

  • An
    Glossary ref
    Extension
    Glossary ref
    Gloss
    Spacetrue
    tExtension
    Gloss
    tConcept
    may be:
    • A national or organizational definition of a glossary-ref
      Gloss
      tconcept
      , which is more rigorous or specific than that generally applied to the glossary-ref
      Gloss
      tSNOMED
      CT
      Concept
      ;
    • An experimental procedure that is not established sufficiently to merit the inclusion in the main body of glossary-ref
      Gloss
      tSNOMED
      CT
      but which may be in a local controlled study.
    Glossary ref
    Extension
    Glossary ref
  • Gloss
    Spacetrue
    tExtension
    Gloss
    tDescriptions
    may be colloquial glossary-ref
    Gloss
    tsynonyms
    for a glossary-ref
    Gloss
    tSNOMED
    CT
    Concept
    or glossary-ref
    Gloss
    tdescriptions
    for an
    Glossary ref
    Extension
    Glossary ref
    Gloss
    Spacetrue
    tExtension
    Gloss
    tConcept
    .
    Glossary ref
    Extension
    Glossary ref
  • Gloss
    Spacetrue
    tExtension
    Gloss
    tRelationships
    may be required to allow analysis packages or decision-support protocols to access additional information about a glossary-ref
    Gloss
    tSNOMED
    CT
    Concept
    or to describe glossary-ref
    Gloss
    trelationships
    between
    Glossary ref
    Extension
    Glossary ref
    Gloss
    Spacetrue
    tExtension
    Gloss
    tConcepts
    :
    • Links between local procedures and relevant administrative actions;
    • Links between local procedures and glossary-ref
      Gloss
      tSNOMED
      CT
      Procedures.
    Glossary ref
    Extension
    Glossary ref
  • Reference
    Gloss
    Spacetrue
    tExtension
    Gloss
    tReference sets
    may group glossary-ref
    Gloss
    tSNOMED
    CT
    Concepts
    in ways that are specific to data entry contexts of a particular application or communication specification.

The

glossary-ref
Gloss
tConcepts
, glossary-ref
Gloss
tDescriptions
, glossary-ref
Gloss
tRelationship
and glossary-ref
Gloss
tReference
Sets
that form an glossary-ref
Gloss
tExtension
must be:

  • Distinguishable from the main body of glossary-ref
    Gloss
    tSNOMED
    CT
    , not only in the thesaurus, but also when stored in a patient record,
    Specref
    RefTypefield
    tquery
    or decision support protocol;
  • Distinguishable from other glossary-ref
    Gloss
    tExtensions
    , in the same way as they are distinguishable from the main body of glossary-ref
    Gloss
    tSNOMED
    CT
    ;
  • Able to be distributed and processed in the same way as equivalent glossary-ref
    Gloss
    tcomponents
    from the main body of glossary-ref
    Gloss
    tSNOMED
    CT
    without requiring specific adaptations of glossary-ref
    Gloss
    tSNOMED-enabled
    applications
    .

The requirements for

glossary-ref
Gloss
tExtensions
can be summarized as follows:

  • Support for extra terminology glossary-ref
    Gloss
    tcomponents
    including glossary-ref
    Gloss
    tConcepts
    , glossary-ref
    Gloss
    tDescriptions
    , glossary-ref
    Gloss
    tRelationships
    and glossary-ref
    Gloss
    tReference
    Sets
    :
    • These extra glossary-ref
      Gloss
      tcomponents
      behave as though they are glossary-ref
      Gloss
      tcomponents
      of glossary-ref
      Gloss
      tSNOMED
      CT
      but they are distinguishable from glossary-ref
      Gloss
      tcomponents
      that are part of the glossary-ref
      Gloss
      tSNOMED
      CT
      International
      Release
      .
  • Globally unique identification of any terminology glossary-ref
    Gloss
    tcomponent
    that may be used outside the scope of a limited local environment:
    • The mechanism allows several organizations to issue mutually exclusive glossary-ref
      Gloss
      tIdentifiers
      for glossary-ref
      Gloss
      tcomponents
      of their glossary-ref
      Gloss
      tExtensions
      .
    • To avoid the risk of misinterpretation, this mechanism is effective in various contexts including:
      • Within the thesaurus;
      • In patient records;
      • In queries, decision-support protocols or knowledge bases.
    • The mechanism indicates when glossary-ref
      Gloss
      tConcepts
      have moved, or are expected to move, between an glossary-ref
      Gloss
      tExtension
      and the glossary-ref
      Gloss
      tInternational
      Release
      , or from one glossary-ref
      Gloss
      tExtension
      to another.
    • A shared understanding of the responsibility of an organization that creates an glossary-ref
      Gloss
      tExtension
      and provides it for the use of other organizations. These responsibilities include:
      • Maintenance of the glossary-ref
        Gloss
        tConcept
        , glossary-ref
        Gloss
        tDescriptions
        , glossary-ref
        Gloss
        tRelationships
        , and glossary-ref
        Gloss
        tReference
        Sets
        ;
      • Inactivation of these glossary-ref
        Gloss
        tcomponents
        as appropriate (duplication, ambiguous, outdated, etc.);
      • Submission to an IHTSDO
        Glossary ref
        Gloss
        tMember
        's glossary-ref
        Gloss
        tNational
        Release
        Centre
        for consideration as an addition to a glossary-ref
        Gloss
        tNational
        Edition
        or to the glossary-ref
        Gloss
        tInternational
        Release
        content.