Purpose

The Map correlation and origin type pattern is used to meet the requirements for representation of maps between SNOMED CT concepts and codes in another code system where the following requirements apply.

A requirement to indicate the degree of correlation between the SNOMED CT concept and the LOINC target code.
A requirement to indicate whether a concept or code was added to either code system as a result of the mapping process and in this case to indicate in which code system the concept or code originated.
No requirements for mapping rules or advice to be included with each map.

Design

The Map correlation and origin type reference set has been designed to meet the requirements as they apply to the maps between LOINC Part Codes and SNOMED CT concepts. The requirements related to representation of map correlation and content origin are clearly stated in the cooperation agreement between IHTSDO and Regenstrief Institute as signed in July 2013.
As there is no requirement for mapping rules or advice, the Simple map type pattern is used as the foundation for this reference set pattern.
Two component references are added to this pattern to meet the additional requirements. These are as follows:

correlationId attribute – added to meet requirement (a).
- The intended use of this attribute is the same as for the correlationId as specified in the "Complex Map Type Reference Set" and the "Extended Map Type Reference Set".
contentOriginId attribute – added to meet requirement (b).
- This attribute has not been used before but is also included in the design of the "Expression Association Reference Set" specified in this document.

Map Correlation and Origin Reference Set Data Structure

Field	Data type	Purpose
id	UUID	A 128 bit unsigned integer, uniquely identifying the reference set member.
effectiveTime	Time	Specifies the inclusive date at which this change becomes effective.
active	Boolean	Specifies whether the member's state was active or inactive from the nominal release date specified by the effectiveTime field.
moduleId	SCTID	Identifies the member version's module. Set to a child of \|Module\| within the metadata hierarchy.
refsetId	SCTID	Identifies the reference set.
referencedComponentId	SCTID	A reference to the SNOMED CT concept being mapped to/from the LOINC Part Code.
mapTarget	String	The value of the LOINC Part Code to which the concept is mapped.
attributeId	SCTID	A reference to the SNOMED CT concept representing the attribute to which the referencedComponentId applies. Usually this will be derived from the LOINC Part Type. In some cases, where there is overloading or non-alignment of Part Types relative to the SNOMED CT Observables Model there may be additional rows mapping the LOINC Part Code to another referencedComponentId which is a value for a different SNOMED CT attribute.
correlationId	SCTID	The correlation between the SNOMED CT concept and the LOINC Part Code. Values are selected children of 447247004 \| SNOMED CT source code to target map code correlation value\| Exact match Broad (SNOMED CT) to narrow LOINC Narrow (SNOMED CT) to broad (LOINC) Partial overlap
contentOriginId	SCTID	Indication of whether concept was initially in one of the terminologies (LOINC or SNOMED CT) and added to the other as part of mapping or was in both terminologies at the outset. Values are subtype children of 705116007 \| Original code system source for linked content value\| Originally in LOINC Originally in SNOMED CT Originally in both LOINC and SNOMED CT

Metadata

Refset Name

900000000000454005 |Foundation metadata concept|
     900000000000455006 |Reference set|
         705111002 |Map correlation and origin type reference set|
             705112009 |LOINC Part map reference set|

Values for correlationId

Use of current value set the following current value set

447247004 |SNOMED CT source code to target map code correlation value|
     447559001 |Broad to narrow map from SNOMED CT source code to target code|
     447557004 |Exact match map from SNOMED CT source code to target code|
     447558009 |Narrow to broad map from SNOMED CT source code to target code|
     447560006 |Partial overlap between SNOMED CT source code and target code|

Values for contentOriginId

705116007 |Original code system source for linked content value|
     705117003 |Originally in LOINC|
     705118008 |Originally in SNOMED CT|
     705119000 |Originally in both LOINC and SNOMED CT|

SNOMED Documentation Search

4.2.1 Map Correlation and Origin Reference Set