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Normal value ranges for vitamin B12 vary slightly among different laboratories and can range anywhere between 200 to 900 pg/mL. The general consensus is values less than 200 pg/mL constitute a B12 deficiency.ormal value ranges for vitamin B12 vary slightly among different laboratories and can range anywhere between 200 to 900 pg/mL. The general consensus is values less than 200 pg/mL constitute a B12 deficiency.
Test Overview. A vitamin B12 test measures the amount of vitamin B12 in the blood. The body needs this B vitamin to make blood cells and to maintain a healthy nervous system. Vitamin B12 is found in animal products such as meat, shellfish, milk, cheese, and eggs.itamin B12 is stored in the liver for a year or more, which reduces a person's risk of anemia. Vitamin B12 is usually measured at the same time as a folic acid test, because a lack of either one or both can lead to a form of anemia called megaloblastic anemia. Lack of vitamin B12 also affects the nervous system.