Role of defining characteristics

contribute the hierarchical type based aspect of a definition. This is augmented by that represent the values of a range of relevant attributes. Depending on the nature of the these may include including etiology, topography, method, etc.

The attributes that can be applied depend on the  of the  . For example, a procedure may have a method, and a disorder may have an etiology, but a procedure cannot have an etiology, and disorder cannot have a method. using a particular attribute will be applied consistently to all to which it is relevant. Note that this design principle may not be fully realized for all attributes in each release.

Representation of defining characteristics

are represented as . The fields are used as follows:

In each release the supported for every are distributed in the . The supported are identified by concept that are  of   . Details supported defining attributes for each concept domain are provided in the SNOMED CT Editorial Guide.

Defining characteristics applied to an example concept



<<< 404684003 |Clinical finding (finding)|


is a subtype of . However, many subtypes of are not subtypes of and there are no additional characteristics available to fully define .



=== 64572001 |Disease (disorder)| :
        370135005 |Pathological process (attribute)| = 441862004 |Infectious process (qualifier value)|


Any with is equivalent to or a subtype of .



=== 40733004 |Infectious disease (disorder)| :
            { 370135005 |Pathological process (attribute)| = 441862004 |Infectious process (qualifier value)|, 
              246075003 |Causative agent (attribute)| = 409822003 |Superkingdom Bacteria (organism)| }


Any with is equivalent to or a subtype of



==== 64572001 |Disease (disorder)| :
            { 116676008 |Associated morphology (attribute)| = 707496003 |Inflammation and consolidation (morphologic abnormality)|, 
              363698007 |Finding site (attribute)| = 39607008 |Lung structure (body structure)| }


Any with is equivalent to or a subtype of .



=== 64572001 |Disease (disorder)| :
            { 370135005 |Pathological process (attribute)| = 441862004 |Infectious process (qualifier value)|, 
              116676008 |Associated morphology (attribute)| = 707496003 |Inflammation and consolidation (morphologic abnormality)|, 
              363698007 |Finding site (attribute)| = 39607008 |Lung structure (body structure)|, 
              246075003 |Causative agent (attribute)| = 409822003 |Superkingdom Bacteria (organism)| }


Any with is equivalent to or a subtype of .



<<< 233604007 |Pneumonia (disorder)| :
            { 116676008 |Associated morphology (attribute)| = 707496003 |Inflammation and consolidation (morphologic abnormality)|, 
              363698007 |Finding site (attribute)| = 39607008 |Lung structure (body structure)| }


is a subtype of . However, is defining attributes are the same as those that apply to . Many other concepts are subtypes of and are not subtypes of . There are no additional defining attributes to distinguish from or its other subtypes.