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Vitamin B-12 level

Normal Values: Normal values are 200-900 pg/ml (picograms per milliliter). What abnormal results mean: Values of less than 100 pg/ml indicate a significant deficiency of vitamin B-12, with symptoms likely to be present or develop. Text Continues Below Causes of vitamin B-12 deficiency include: Inadequate intake (rare except with a strict vegetarian diet) Malabsorption diseases (for example, celiac disease and sprue) Lack of intrinsic factor Hypermetabolic state (for example, with hyperthyroidism) Pregnancy Increased vitamin B-12 levels are uncommon, because normally excessive B-12 is excreted in the urine. However, excessive B-12 may occur with disorders that affect the levels of proteins that attach to vitamin B-12 in the blood. These disorders include: Liver disease (such as cirrhosis or hepatitis) Myeloproliferative disorders (for example, myelocytic leukemia) Additional conditions under which the test may be performed: Delirium Dementia Dementia due to metabolic causes

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