3 doctors weighed in:
Does a B12 test require serum or plasma?
3 doctors weighed in

Dr. Kelty Baker
Internal Medicine - Hematology
2 doctors agree
In brief: B12 testing
Testing for vitamin B12 deficiency is done on serum samples.

In brief: B12 testing
Testing for vitamin B12 deficiency is done on serum samples.
Dr. Kelty Baker
Dr. Kelty Baker
Thank
1 comment
Dr. Andrew Turrisi
B-12 deficiencies cause macrocytic anemias (High MCHC on the CBC); B12 absorbtion requires intrinsic factor, produced in the stomach. B-12 shots are red, and used for placebo effect by some.
Get help from a real doctor now
Dr. Steven Seres
Board Certified,
17 years in practice
497K people helped
Continue
108,000 doctors available
Read more answers from doctors