I am going for iron and b12 blood tests in about 6 weeks would it be better to stop supplements before? If so how long before? I would prefer injections if poss especially iron because its not easy to take and gp said b12 pills don't work anyway but I take methylcolbamin which are expensive so injections would be good for b12 too!
Does anyone know if it is best to stop suppleme... - Thyroid UK
Does anyone know if it is best to stop supplements before b12 and iron blood tests?
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For B12 testing info, this is a good document : biolab.co.uk/docs/vitaminB1...
This paragraph discusses how long you should be off B12 before testing :
"Patient preparation
Patients should refrain from taking nutritional supplements for 24 hours before venipuncture. If supplements containing vitamin B 12 have been taken in the month prior to venipuncture, details should be given on the request form. Recent i.m. B 12 therapy may also complicate interpretation of the results. "
For iron I think 7 days off is necessary - see :
I understood it was necessary to stop B12 4-8 weeks prior to testing.
Don't know about iron.
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