I am currently working with laboratory data and using LOINC codes for parameter identification. My question is:
Is there a standardized or unified reference range associated with LOINC codes that could be used as a general guideline to classify values as low, normal, or high?
Or are the reference intervals expected to be provided individually by the submitting organization or laboratory for each measurement?
Any clarification on how reference intervals are handled in the context of LOINC-coded data would be highly appreciated.
The short answer is reference ranges are not associated with LOINCs. In the US CLIA and globally usually ISO regulations require each (performing) laboratory to determine the reference ranges for their patient population.
If you are looking for interpretations of reference ranges as low, high,critical high, critical low etc., these are also usually provided where applicable by the performing laboratory for result values.