Test guide
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 when you digest protein. MMA is needed for metabolism, which is the process that your body uses to change food into energy.
What it is for
An MMA test is most often used to diagnose a vitamin B12 deficiency. The test is usually also included as part of a series of tests called a newborn screening . A newborn screening checks for a variety of health conditions. An MMA test checks for methylmalonic acidemia , a rare genetic disorder . Symptoms of this disorder can range from mild to severe and may include: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
Also known as
- MMA
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