Individual test · Labcorp 716365

Methylmalonic Acid, Urine

This test measures the amount of methylmalonic acid (MMA) in your urine, a substance that builds up when your body lacks Vitamin B12. It helps show whether your tissues have enough of this vitamin to function properly, which is important if you are experiencing fatigue, weakness, or nerve issues. This measurement helps doctors distinguish between a true Vitamin B12 deficiency and other conditions with similar symptoms. However, this test alone cannot determine the specific underlying cause of the deficiency.