This seems like a good idea to better capture the ranges… I am not sure about how to capture the interpretation as a separate value. It seems that in some cases LOINC has separate LOINC codes for the interpretation. However, if we are simply recording the Normal, abnormal, HIGH, LOW, etc. as compared to the lab’s reference range for the patient, then I agree that it makes sense to add this as a structured field attached to the numeric result.
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