Also Known As: Cobalamin test, pernicious anemia test, micronutrient test, essential vitamin test
Vitamin B12 testing measures the level of that vitamin in your blood. Having a vitamin B12 deficiency, or a low level of this essential vitamin, can cause a range of health issues, including anemia and nervous system problems.
Vitamin B12 levels may be low for many reasons, including inadequate dietary intake, the use of certain medications, advanced age, or conditions that make it harder for the body to absorb vitamin B12 from your food.
Testing for vitamin B12 requires a sample of blood. Measuring your vitamin B12 level helps your health care provider diagnose a possible deficiency and recommend appropriate treatment.