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An association between a source concept and 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.


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)


  • Relationship

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