what is normal range for b12 in blood
Best Answer: Normal B12 range is 200 to 600, so your results are considered low. The bloodwork that the other doctors did might not have included a B12 test.12 is stored in the liver, so it can take some time (even years) for a B12 deficiency to show up after you've had problems absorbing it. (Usually it's related to lack of intrinsic factor in the stomach.) Mono (Epstein-Barr Virus) and CMV can certainly cause fibromyalgia-like symptoms.