Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
MMA rises when your cells don't have enough B12.
Why it's done
- Borderline B12 level
- Numbness, memory problems, or anemia possibly from low B12
Getting ready and what happens
- No special preparation is usually needed.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
High
Supports B12 deficiency. Kidney disease can also raise it.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.