When implementing postcoordinated SNOMED CT expressions, there are different approaches to storage that may be considered.
- Store the full expression in the same way as you would store any coded data item (section 4.3.1 Store the Full Expression)
- Reference the expression in the record storage using a local expression identifier, and hold the expressions in a separate expression repository (section 2.2.2 Store Expression Identifier)
- Store the expression parts individually in separate fields (section 2.2.3 Store Expression Parts Individually)
Each of these approaches are described in the following pages:
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