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A member asked:
How accurate are blood tests for b12 vitamin when not fasting?
A doctor has provided 1 answer
Accurate: We pathologists are focused on labs. In testing for B12 deficiency, we're looking largely at the ability to absorb it, and perhaps at its absence in the diet (even modest vegetarians are prone to be low). A non-fasting serum B12 in the normal range would reassure me and i'd not ask for a repeat fasting.
Answered 6/24/2014
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