Why get tested?To help detect early and/or mild
vitamin B12 deficiency, especially at the tissue level; to help diagnose methylmalonic acidemia, a rare inherited metabolic disorder
When to get tested?If you have a vitamin B12 concentration in the low end of the normal range and/or have symptoms of neuropathy, such as numbness and tingling in the hands and feet
Sample required?A blood sample drawn from a vein in your arm or a
random or
24-hour urine sample
Note: You may be instructed to fast before sample collection for this test.