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An association between a source conceptand a destination concept. The type of association is indicated by a reference to an attribute concept.


  1. Each relationship provides defining information about the source concept.

  2. Relationships are represented by rows in the Relationship File Specification.


The relationship in the table below states that part of the definition of the concept 74400008 |appendicitis| is that its  363698007 |finding site| is the 66754008 |appendix structure|.

Table: Example of a Relationship (for clarity the US English preferred term is shown for each concept)


  • SNOMED CT relationship

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