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The defining characteristics can be divided into
relationships and defining attribute relationships.Concept t 116680003 |Is a (attribute)|
The ISThe IS_A relationship relationship (also called supertype-subtype or parent-child relationshipcalled supertype-subtype or parent-child relationship) builds the hierarchies in SNOMED in SNOMED CT. Every concept has at least one IS_A relationship to a supertype or parent concept.
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Every concept has at least one IS_A relationship to a supertype or parent concept except the top level concept,
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Each concept in SNOMED CT is logically defined through its relationships to other concepts. A relationship is defined as an association between a source concept and a destination concept. The type of association is indicated by an attribute concept. It is the relationships that make up the defining characteristics of the concepts. A defining characteristic is a relationship to a target concept that is always necessarily true for any instance of the source concept.
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