| Source Element | Usage | Target |
|---|---|---|
| Ratio.id | UseElementSameName | Ratio.id |
| Ratio.extension | UseElementSameName | Ratio.extension |
| Ratio.numerator | UseElementSameName | Ratio.numerator |
| Ratio.denominator | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-Ratio.denominator |