I have had tingling sensations in my hands and legs for the last 3 years, but I have not checked my vitamin B12. Yesterday, I took my first tablet of vitamin B12, 1500 mcg. I am planning to go for the test tomorrow. My concern is, will the tablet I took affect my test report or show any false results since I have taken it only once?

Answered by 1 Apollo Doctors

Dr Shaik Kalam

General Practitioner

MD (Physician)
3+ Yrs

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A single dose of oral B12 just a day before the test usually has minimal impact on serum B12 levels. Proceed with testing but inform the lab about the supplement taken. For accuracy, repeat Serum Vitamin B12 after 3 days if needed.

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Answered 16/09/2025

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