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Each

The

• Gloss
  PreSpace false t Check-digit

  validation of the identifier.

  • The

    Gloss
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    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

  Gloss
  PreSpace false t SNOMED CT component.

  • A two-digit

    Gloss
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    distinguishes the identifiers of different component types and prevents the same identifier from being allocated to both a

    Gloss
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    and a

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    As a result, when an

    Specref
    RefType (data type) t SCTID

     is read from a record or other resource, it is possible to determine whether it represents a

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    a

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    or a

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    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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      PreSpace false t partition 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
      PreSpace false t namespace identifier

      and is only applicable to components originated and maintained by the

      Gloss
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      as part of the

      Gloss
      PreSpace false t International Release

      of

      Gloss
      PreSpace false t SNOMED CT.

    • Long format in which the

      Gloss
      PreSpace false t partition identifier

      value indicates that a separate

      Gloss
      PreSpace false t namespace identifier

      is required to distinguish between components originated as part of an

      Gloss
      PreSpace false t extension

      created by an appropriately authorized organization .

SCTID Short Format - Applicable to components originating from the International Release

SCTID Long Format - Applicable to components originating from a SNOMED CT Extension