What is a methylmalonic acid (MMA) test?
This test measures the amount of methylmalonic acid (MMA) in your blood or urine. MMA is a substance made in small amounts during metabolism. Metabolism is the process of how your body changes food into energy. Vitamin B12 plays an important role in metabolism. If your body doesn't have enough vitamin B12, it will make extra amounts of MMA. High MMA levels can be a sign of a vitamin B12 deficiency. Vitamin B12 deficiency can lead to serious health problems including anemia, a condition in which your blood has a lower than normal amount of red blood cells.
Other names: MMA
