Purpose

An 900000000000521006 | Association type reference set| represents a set of unordered associations of a particular type between components.

Data structure

An Association reference setis a reference setused to represent associations between components. Its structure is shown in the following table.

Field	Data type	Purpose	Mutable	Part of Primary Key
id	UUID	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	YES (Full/Snapshot)
effectiveTime	Time	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)
active	Boolean	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
moduleId	SCTID	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
refsetId	SCTID	Identifies the reference setto which this reference set memberbelongs. In this case, set to as subtype descendant of: ??	NO	NO
referencedComponentId	SCTID	A reference to the SNOMED CT componentto be included in the reference set.	NO	NO
targetComponentId	SCTID	The identifier of the target componentof the association.	NO	NO

Metadata

The following metadata supports this reference set:

   900000000000455006 |Reference set|
         900000000000521006 |Association type|
                 900000000000522004 |Historical association|
                         900000000000523009 |POSSIBLY EQUIVALENT TO association reference set|
                         900000000000524003 |MOVED TO association reference set|
                         900000000000525002 |MOVED FROM association reference set|
                         900000000000526001 |REPLACED BY association reference set|
                         900000000000527005 |SAME AS association reference set|
                         900000000000528000 |WAS A association reference set|
                         900000000000529008 |SIMILAR TO association reference set|
                         900000000000530003 |ALTERNATIVE association reference set|
                         900000000000531004 |REFERS TO concept association reference set|

Historical Association Rules and Guidance

Each member of a 900000000000522004 | Historical association| reference set represents a reference from an inactive componentto other equivalent or related componentsthat were current in the Release Versionin which that componentwas inactivated.

Each 900000000000522004 | Historical association| reference set represents a different type of association between the components referred to by the referencedComponentId and the targetComponentId as shown in .

Association reference set	Descriptions
900000000000523009 \| POSSIBLY EQUIVALENT TO association reference set\|	Applies to a concept that is ambiguous. The targetComponent is an active concept that represents one of the possible meanings of the inactive concept . Multiple rows are used to refer to each of the possible meanings of the ambiguous concept.
900000000000524003 \| MOVED TO association reference set\|	Applies to a component that has been moved to (or are pending a move to) another namespace. The targetComponent identifies the target namespace (not the new component ).
900000000000525002 \| MOVED FROM association reference set\|	Applies to a component that has been moved to this namespace from another namespace. The targetComponent identifies the original component Identifier in its previous namespace.
900000000000526001 \| REPLACED BY association reference set\|	Applies to an erroneous, obsolete and other inactive component for which there is a single active replacement. The targetComponent identifies the active component that replaces this component.
900000000000527005 \| SAME AS association reference set\|	Applies to a component that is a duplicate. The targetComponent identifies the active component that this component duplicates.
900000000000528000 \| WAS A association reference set\|	Links an inactive classification concept such as "not otherwise specified" or "otherwise specified" with the active concept that was formerly its most proximal supertype.
900000000000529008 \| SIMILAR TO association reference set\|	(not used currently)
900000000000530003 \| ALTERNATIVE association reference set\|	Links an inactive classification concept derived from ICD-9 Chapter XVI "Symptoms signs and ill-defined conditions" with the most similar active concept.
900000000000531004 \| REFERS TO concept association reference set\|	Applies to an inactive description which is inappropriate to the concept it is directly linked to but instead should refer to the concept referenced by the targetComponent.

The componentidentified by the targetComponentId must be an instance of the same class of componentas the componentidentified by the referencedComponentId for all |Historical association| reference setsapart from the |REFERS TO conceptassociation reference set|.

Reference Set Descriptor and Example Data

Notes on the tables used to show descriptors and examples

The reference set example tables on this page have been revised as follows to aid clarity and understanding:

The first four columns which are present in all release files are not shown. The omitted columns (id, effectiveTime, active, moduleId) are used in the same way in all referenced sets to support identification, versioning and packaging. They do not directly affect the specific features of a particular reference set or reference set type.
Reference set columns that contain SNOMED CT identifiers are expanded to show details of the concept or description referenced by that identifier. In some cases, the term is shown in the same column using the expression syntax, in other cases an additional column with a name suffix '_term' has been added. In the standard reference set files only the identifier is present in the column and there is no added column for the term. When using reference sets, the term and other details of the component are looked up from the relevant component release files.

Descriptor Template

The tables below show examples of the descriptors for specific reference setsthat follow the 900000000000521006 | Association type reference set| pattern.

refsetId	referencedComponentId (Referenced component)	attributeDescription (Attribute description)	attributeType (Attribute type)	attributeOrder (Attribute order)
900000000000456007 \| Reference set descriptor\|	900000000000527005 \| SAME AS association reference set\|	900000000000532006 \| Association source component\|	900000000000460005 \| Component type\|	0
900000000000456007 \| Reference set descriptor\|	900000000000527005 \| SAME AS association reference set\|	900000000000533001 \| Association target component\|	900000000000460005 \| Component type\|	1

Example Data

The following table holds example entries for the 900000000000526001 | REPLACED BY association reference set| .

refsetId	referencedComponentId (Association source component)	targetComponentId (Association target component)
900000000000526001 \| REPLACED BY association reference set\|	100005 \| SNOMED RT Concept\|	138875005 \| SNOMED CT Concept\|
900000000000526001 \| REPLACED BY association reference set\|	212002 \| Salmonella III arizonae 53:k:z\|	398450001 \| Salmonella IIIb 53:k:z\|
900000000000526001 \| REPLACED BY association reference set\|	225005 \| Special care of patient with contagious disease\|	133895001 \| Care of patient with infectious disease\|
900000000000526001 \| REPLACED BY association reference set\|	244003 \| Evans and Lloyd-Thomas syndrome\|	66659007 \| Normal variation in position\|
900000000000526001 \| REPLACED BY association reference set\|	278009 \| Epidural injection of neurolytic substance, lumbar\|	17753007 \| Epidural injection of neurolytic solution, lumbar\|
900000000000526001 \| REPLACED BY association reference set\|	558000 \| Other disorder of the neurohypophysis, NEC\|	72442006 \| Disorder of posterior pituitary\|
900000000000526001 \| REPLACED BY association reference set\|	659001 \| Peptostreptococcus anaerobius\|	413524006 \| Anaerococcus tretradius\|
900000000000526001 \| REPLACED BY association reference set\|	696005 \| Chronobiologic disorder\|	387605007 \| Abnormal chronobiologic state\|
900000000000526001 \| REPLACED BY association reference set\|	700002 \| Salmonella III arizonae 50:z4,z23,z32:--\|	404619004 \| Salmonella IIIa 50:z4,z23,z32:-\|
900000000000526001 \| REPLACED BY association reference set\|	822000 \| Salmonella arizonae 53:z4,z23:--\|	13998005 \| Salmonella IV 53:z4,z23:--\|

Relevant References

Practical Guide or Reference Sets 3.2.6.3.2. Representing Historical Associations
Terminology Services Guide 4.2.3 Historical Association Reference Sets.

refsetId	referencedComponentId (Referenced component)	attributeDescription (Attribute description)	attributeType (Attribute type)	attributeOrder (Attribute order)
900000000000456007 \| Reference set descriptor\|	900000000000527005 \| SAME AS association reference set\|	900000000000532006 \| Association source component\|	900000000000460005 \| Component type\|	0
900000000000456007 \| Reference set descriptor\|	900000000000527005 \| SAME AS association reference set\|	900000000000533001 \| Association target component\|	900000000000460005 \| Component type\|	1

refsetId	referencedComponentId (Association source component)	targetComponentId (Association target component)
900000000000526001 \| REPLACED BY association reference set\|	100005 \| SNOMED RT Concept\|	138875005 \| SNOMED CT Concept\|
900000000000526001 \| REPLACED BY association reference set\|	212002 \| Salmonella III arizonae 53:k:z\|	398450001 \| Salmonella IIIb 53:k:z\|
900000000000526001 \| REPLACED BY association reference set\|	225005 \| Special care of patient with contagious disease\|	133895001 \| Care of patient with infectious disease\|
900000000000526001 \| REPLACED BY association reference set\|	244003 \| Evans and Lloyd-Thomas syndrome\|	66659007 \| Normal variation in position\|
900000000000526001 \| REPLACED BY association reference set\|	278009 \| Epidural injection of neurolytic substance, lumbar\|	17753007 \| Epidural injection of neurolytic solution, lumbar\|
900000000000526001 \| REPLACED BY association reference set\|	558000 \| Other disorder of the neurohypophysis, NEC\|	72442006 \| Disorder of posterior pituitary\|
900000000000526001 \| REPLACED BY association reference set\|	659001 \| Peptostreptococcus anaerobius\|	413524006 \| Anaerococcus tretradius\|
900000000000526001 \| REPLACED BY association reference set\|	696005 \| Chronobiologic disorder\|	387605007 \| Abnormal chronobiologic state\|
900000000000526001 \| REPLACED BY association reference set\|	700002 \| Salmonella III arizonae 50:z4,z23,z32:--\|	404619004 \| Salmonella IIIa 50:z4,z23,z32:-\|
900000000000526001 \| REPLACED BY association reference set\|	822000 \| Salmonella arizonae 53:z4,z23:--\|	13998005 \| Salmonella IV 53:z4,z23:--\|

Search

4.2.5. Association Reference Set