What’s with these normal ranges for ceruloplasmin?
What’s with these normal ranges for ceruloplasmin?! Over the past 18 months I’ve used walkinlab, which uses LabCorp, to have my ceruloplasmin checked a few times. At first the normal range was 15 – 30, then it became 16 – 31. Just a little bump is fine. But then I noticed on this forum someone posting results from requestatest, which also uses LabCorp, and the normal range was 19 – 39!! We are talking about a 20% bump on the low end and a 30% bump on the high end. Does requestatest post their own normal ranges instead of using the LabCorp ranges?? Can other folks here verify what I am seeing? Any explanation?? Based on the lab results posted here I think the LabCorp range (16 – 31) seems more realistic.
I thought that normal ranges ordinarily reflect the lab results for 95% of the samples processed. Some variation between labs of +-10% is not unreasonable. And sometimes normal ranges are what have been used by convention for A LONG time, therefore questioning its validity (the 30 – 100 range for storage vitamin D comes to mind).
I do apologize if this subjects has been discussed before, … this is the first time I’ve seen this aberration.