Just wondered after seeing some people’s B12 results in the 1000’s following SI. Is there an upper limit where this reading tops out or is no longer within a readable range?
Is there a B12 maximum reading? - Pernicious Anaemi...
Is there a B12 maximum reading?
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Yes, all assays will have a level that is the maximum amount they can detect.
In the past my B12 was described as >5999 ng/L. Nowadays is is always >2000 pmol/L.
Obviously they changed the assay type about 4 years ago, and the new one uses different units and has a lower top limit.
in reply to fbirder
That’s very interesting. Thank you.
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