The
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Code to expression type reference set|
is designed to enable associations between code in another code system (other-codes) and SNOMED CT concepts, where the following constraints apply: The general approach to the above requirements is to associate each of the other-codes with a representation of the same logic based definition as would have been applied to a SNOMED CT concept with that meaning. However, since the other-code are not identified by an SCTID, the logical definition cannot be represented using defining relationships. There are two potential approaches to this, one would be to use a general purpose description logic language (e.g. OWL) and the other is to use a SNOMED CT expression to represent each definition. The
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Code to expression type reference set|
is designed to support the expression-based approach. Field Data type Purpose id A 128 bit unsigned Integer, uniquely identifying this reference set member. Different versions of a reference set member share the same id but have different effectiveTime. This allows a reference set member to be modified or made active (i.e. removed from the active set) at a specified time. NO The inclusive date or time at which this version of the identified reference set memberbecame the current version. The current version of this reference set memberat time T is the version with the most recent effectiveTime prior to or equal to time T . YES YES (Full) Optional (Snapshot) The state of the identified reference set memberas at the specified effectiveTime . If active = 1 (true) the reference set memberis part of the current version of the set, if active = 0 (false) the reference set memberis not part of the current version of the set. YES NO Identifies the SNOMED CT modulethat contains this reference set memberas at the specified effectiveTime . The value must be a subtypeof
900000000000443000
|
Module (core metadata concept)|
within the metadata hierarchy. YES NO Identifies the reference setto which this reference set memberbelongs. In this case, set to as subtype descendant of:
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Code to expression type reference set|
A reference to the SNOMED CT componentto be included in the reference set. The other-code to/from which the concept is mapped. A SNOMED CT expression that represents the SNOMED CT definition of the other-code. This expression may be a stated or inferred view of the definition provided that documentation of each identified reference set specifies the view provided. The expression must conform to the syntax defined in the SNOMED CT Compositional Grammar - Specification and Guide (http://snomed.org/scg). Indicates whether or not the expression contains a sufficient definition of the other-code in the mapTarget field. The correlation between the SNOMED CT expression and the other-code. Possible values are the following subtypes of
447247004
|
SNOMED CT source code to target map code correlation value|
: When these values are applied to this reference set type, the phrase "SNOMED source code" is interpreted as meaning "SNOMED expression" and "target code" refers to the other-code.. Indication of whether the concept was initially in one of the terminologies (SNOMED CT or other-codes) and added to the other as part of mapping or was in both terminologies at the outset. Values are subtypes of
705116007
|
Original code system source for linked content value|
.Purpose
Data Structure
Part of Primary Key YES (Full/Snapshot) NO NO NO NO NO NO YES NO
Possible values are the following subtypes of
900000000000444006
|
Definition status|
:YES NO YES NO YES NO
Related Links
- For further information see Using LOINC with SNOMED CT: 4.2.2 LOINC Term to Expression Reference Set.
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