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Vitamins

Methylmalonic Acid (MMA) (Blood)

MMA Blood measures a functional marker of B12 status in your blood. For men, this test may help identify cellular B12 deficiency that standard tests might miss, potentially affecting energy, cognitive function, and physical performance.

Doctor's Assessment Included

Reference Ranges

No established reference range

Dutch laboratories disagree on the blood methylmalonic-acid upper limit (0.31 µmol/l VUmc to 0.45 µmol/l Erasmus MC) and the value is method-dependent. A single fixed cut-off would produce false abnormal flags; there is no national consensus.

Unit: umol/l

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

This test measures methylmalonic acid in your blood, a metabolite that accumulates when vitamin B12 is insufficient for normal metabolic reactions. MMA is considered a sensitive functional marker because it reflects actual B12 activity within your cells.

Why It Matters

Men with elevated MMA may have functional B12 deficiency affecting muscle function, energy metabolism, and neurological health. This test could provide insight beyond standard B12 testing, helping your healthcare provider make more informed treatment decisions.

When to Test

Testing may be recommended when B12 deficiency is suspected but standard tests are inconclusive, when you have symptoms suggesting B12 deficiency with normal B12 levels, or to monitor the effectiveness of B12 treatment. Consult your healthcare provider.

Symptoms

Low Levels

Low MMA levels are generally considered normal and desirable, indicating adequate vitamin B12 function at the cellular level. This typically means your body has sufficient B12 to support its metabolic processes.

High Levels

Some people with elevated MMA levels may experience fatigue, weakness, tingling or numbness in extremities, cognitive difficulties, and balance problems. These symptoms may indicate functional B12 deficiency that should be evaluated by a healthcare provider.

Lifestyle Tips

If MMA levels are elevated, increasing B12 intake through diet or supplementation may be recommended by your healthcare provider. Regular monitoring can help track whether interventions are effectively lowering MMA back to normal levels.

Frequently Asked Questions

Why test MMA if I already tested B12?
MMA is a functional marker that reflects how B12 is being used at the cellular level. You can have seemingly normal B12 blood levels while still experiencing functional deficiency. MMA testing may reveal this hidden insufficiency.
Can kidney function affect MMA results?
Yes, reduced kidney function can cause MMA levels to rise independently of B12 status, since the kidneys are involved in clearing MMA from the blood. Your healthcare provider should consider kidney function when interpreting MMA results.
How quickly do MMA levels respond to B12 treatment?
MMA levels typically begin to decrease within days to weeks of adequate B12 supplementation. Your healthcare provider may recommend retesting after a period of treatment to confirm that levels are normalising.

Tests with related values

These panels measure values from the same category as this marker.

Methylmalonic Acid (MMA) (Blood)

€149,-