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Each

Specref
RefType(data type)
tSCTID
identifies a
Gloss
SpacePreSpacetruefalse
tSNOMED CT component.
The identifier itself does not contain information related to the meaning of a
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tconcept
or
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tdescription.
This means it is not possible to infer anything about the meaning of a
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tconcept
from the numeric value of the identifier or from the sequence of digits in that form of the identifer. The meaning of a
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tconcept
can be determined from
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trelationships
to other
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tconcepts
and from associated
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tdescriptions
that include human readable terms.

The

Specref
RefType(data type)
tSCTID
 does however have a structure which includes valuable information about the nature and source of the identified component and the validity of the identifier. This structure supports the following features:

  • Gloss
    SpacePreSpacetruefalse
    tCheck-digit
    validation of the identifier.

    • The

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      tcheck-digit
      is the final digit in the decimal rendering of the identifier. This can be checked to minimize errors from transcription or incomplete copy-paste actions.

  • Partitioning between identifiers for different types of

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    PreSpacefalse
    tSNOMED CT component.

    • A two-digit

      Gloss
      SpacePreSpacetruefalse
      tpartition-identifier
      distinguishes the identifiers of different component types and prevents the same identifier from being allocated to both a
      Gloss
      SpacePreSpacetruefalse
      tconcept
      and a
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      tdescription.
      As a result, when an
      Specref
      RefType(data type)
      tSCTID
       is read from a record or other resource, it is possible to determine whether it represents a
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      tconcept,
      a
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      trelationship
      or a
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      tdescription,
      before searching for the identified component.

  • Namespaces to separate component identifiers originated by different organizations. 

    • Organizations are only permitted to issue identifiers which fall within a specified namespace of potential identifier values. This prevents collisions between identifiers issues by different organizations which would otherwise result in ambiguity and errors when sharing data.

    • There are two formats used for representing namespaces. 
      • Short format in which

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        tpartition-identifiers
        are reserved for an organization which is permitted to issue any valid identifiers within the allocated partitions. The short format approach does not require a specific
        Gloss
        SpacePreSpacetruefalse
        tnamespace-identifier
        and is only applicable to components originated and maintained by the
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        SpacePreSpacetruefalse
        tSNOMED International
        as part of the
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        SpacePreSpacetruefalse
        tInternational Release
        of
        Gloss
        PreSpacefalse
        tSNOMED CT.

      • Long format in which the

        Gloss
        SpacePreSpacetruefalse
        tpartition-identifier
        value indicates that a separate
        Gloss
        SpacePreSpacetruefalse
        tnamespace-identifier
        is required to distinguish between components originated as part of an
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        SpacePreSpacetruefalse
        textension
        created by an appropriately authorized organization .

  


 


Info

The

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tSNOMED International
allocates
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tnamespace-identifiers
to organizations such as
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tMembers
and
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tAffiliates
to enable them to create content and or derivatives in an
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SpacePreSpacetruefalse
textension.
The
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SpacePreSpacetruefalse
tnamespace-identifiers
enables unique 
Specref
RefType(data type)
tSCTID
 to be issued by many organizations and allow each 
Specref
RefType(data type)
tSCTID
 to be traced to an authorized originating organization.

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