This is the CodeSystem that contains codes in both ObservationreferenceRangeNormalValue (http://terminology.hl7.org/CodeSystem/observation-referencerange-normalvalue) and ObservationreferenceRangeNormalValue (http://terminology.hl7.org/CodeSystem/observation-referencerange-normalvalue).
Generated Narrative: CodeSystem 818959f7-0f8d-4f6f-b46c-7c5a5833d862-717
This code system http://hl7.org/fhir/comparison/CodeSystem/818959f7-0f8d-4f6f-b46c-7c5a5833d862-717 defines codes, but no codes are represented here
| Code | Display | Definition |
| negative | Negative | The expected normal value for the observation is negative. |
| absent | Absent | The expected normal value for the observation is absent. |