How Long Before A Folic Acid Blood Test Should Supplements Be Discontinued?
Straight away or 3 day break
Detailed Answer:
Hello and Welcome
I appreciate your concern
1) For folic acid , serum levels fluctuate with supplementation. Hence you should ask for RBC Folate levels that aren't affected by acute rise and fall and is a better test.
2) For B 12 , if the MMA ( Methyl malonic acid ) and Homocysteine are normal then even lower range B 12 are acceptable and don't require further treatment.
You can get tested for both straight away or after 3 days break from the supplement.
Wishing you best of health
Thanks
Please consult your doctor before deciding on any further course of action.
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Dr. M.S. Khalil