Individual test · Labcorp 141503

Vitamin B12 Deficiency Cascade

This test measures the amount of Vitamin B12 in your blood and may automatically check a substance called methylmalonic acid (MMA) if your initial results are unclear. It helps determine if your body has enough B12 to support healthy nerve and blood cells, which is important if you are experiencing fatigue or tingling in your hands and feet. By looking at both markers, this test helps distinguish between a true vitamin deficiency and a normal result when standard tests are borderline. While it identifies low levels, it does not diagnose the specific underlying cause of the deficiency, such as diet or an absorption problem, without further evaluation.