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An

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

Such a mechanism allows:

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

This structure also enables specialized

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

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

The

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

  • Distinguishable from the main body of
    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
    Gloss
    tExtensions
    , in the same way as they are distinguishable from the main body of
    Gloss
    tSNOMED CT
    ;
  • Able to be distributed and processed in the same way as equivalent
    Gloss
    tcomponents
    from the main body of
    Gloss
    tSNOMED CT
    without requiring specific adaptations of
    Gloss
    tSNOMED-enabled applications
    .

The requirements for

Gloss
tExtensions
can be summarized as follows:

  • Support for extra terminology
    Gloss
    tcomponents
    including
    Gloss
    tConcepts
    ,
    Gloss
    tDescriptions
    ,
    Gloss
    tRelationships
    and
    Gloss
    tReference Sets
    :
    • These extra
      Gloss
      tcomponents
      behave as though they are
      Gloss
      tcomponents
      of
      Gloss
      tSNOMED CT
      but they are distinguishable from
      Gloss
      tcomponents
      that are part of the
      Gloss
      tSNOMED CT International Release
      .
  • Globally unique identification of any terminology
    Gloss
    tcomponent
    that may be used outside the scope of a limited local environment:
    • The mechanism allows several organizations to issue mutually exclusive
      Gloss
      tIdentifiers
      for
      Gloss
      tcomponents
      of their
      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
      Gloss
      tConcepts
      have moved, or are expected to move, between an
      Gloss
      tExtension
      and the
      Gloss
      tInternational Release
      , or from one
      Gloss
      tExtension
      to another.
    • A shared understanding of the responsibility of an organization that creates an
      Gloss
      tExtension
      and provides it for the use of other organizations. These responsibilities include:
      • Maintenance of the
        Gloss
        tConcept
        ,
        Gloss
        tDescriptions
        ,
        Gloss
        tRelationships
        , and
        Gloss
        tReference Sets
        ;
      • Inactivation of these
        Gloss
        tcomponents
        as appropriate (duplication, ambiguous, outdated, etc.);
      • Submission to an
        Gloss
        tMember
        's
        Gloss
        tNational Release Centre
        for consideration as an addition to a
        Gloss
        tNational Edition
        or to the
        Gloss
        tInternational Release
        content.