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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.
A vitamin B12 level test measures the amount of B12 in your blood. B12 is an important vitamin for many basic bodily functions, such as brain health, blood cell production, and proper nerve functioning.Low B12 levels can lead to serious nerve damage and deteriorating brain functions. vitamin B12 level test measures the amount of B12 in your blood. B12 is an important vitamin for many basic bodily functions, such as brain health, blood cell production, and proper nerve functioning.