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Precoordinated expressions are expressions that represent the meaning of individual concepts which are predefined in SNOMED CT. Besides the unique concept identifier and descriptions, each concept also has a formal logic definition represented by a set of defining relationships to other concepts. The figure below shows the precoordinated expression used to record |fracture of tibia|. It illustrates that this can be represented by a single identifier, with or without an accompanying human-readable term. It also illustrates the defining relationships of the concept identified in the expression. This is the precoordinated definitional knowledge which is conveyed by this expression.
Precoordinated expression representing fracture of tibia
| Identifier only | 31978002 |
With display term | 31978002 |fracture of tibia | | |
Graphic view of the defining relationships of the concept |fracture of tibia| |
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The second example shown below illustrates the fact that some SNOMED CT concepts provide quite a lot of detailed refinement, some of which might otherwise be captured separately. We will return to this example when considering postcoordination.
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The following graphics illustrate the ways in which query predicates based on SNOMED CT concept definitions can be used to retrieve data based on different criteria. In each case, the data retrieved includes expressions that either have attributes matching the criteria or refer to a concept with defining relationships that match the query criteria.
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Example: Result of retrieving concepts with |associated morphology| specified as |benign neoplasm|
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Example: Result of retrieving concepts with |finding site| specified as |kidney|Gliffy Diagram
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