Methylmalonic acid (MMA): what your result means.

A metabolite that rises with B12 deficiency; confirms functional B12 status. Methylmalonic acid (MMA) is measured by blood test as part of the Nutritional panel in the HodieLabs Health Blueprint.

Why Methylmalonic acid (MMA) matters

Optional; improves specificity for B12 deficiency. Interpret using the reporting lab’s reference interval and clinical context; trend over time is often more informative than a single value.

Associated risks when out of range: Elevated MMA is specific for functional B12 deficiency (tissue-level), Can distinguish B12 deficiency from folate deficiency (MMA normal in folate deficiency).

What the clinical evidence shows

The evidence base behind how the HodieLabs Evidence-Based Clinical Library interprets Methylmalonic acid (MMA), from randomised trials, prospective cohorts and genetic (Mendelian randomisation) studies. Full citations in the reference list below.

• Diagnostic validation series (Savage et al. American Journal of Medicine 1994): elevated MMA detected B12 deficiency with ~98% sensitivity, catching functional deficiency in patients whose serum B12 looked low-normal, which is exactly the gap MMA testing closes.

Evidence-based reference ranges

The HodieLabs Evidence-Based Clinical Library interprets Methylmalonic acid (MMA) against published clinical authority standards, never arbitrary "optimal" ranges. Measured in µmol/L:

Clinical interpretation

• Optional; improves specificity for B12 deficiency.
• Interpret using the reporting lab’s reference interval and clinical context; trend over time is often more informative than a single value.

What improves it: the evidence-based levers

• MMA is the confirmatory test when B12 is borderline (200–300 pmol/L)
• Elevated MMA with normal B12 confirms functional (tissue) B12 deficiency

Recommended testing frequency: Annual, as part of a comprehensive panel. Single markers are always interpreted in context.

How Methylmalonic acid (MMA) testing works at HodieLabs

Methylmalonic acid (MMA) is measured in every Health Blueprint at our Melbourne Preventative Health & Longevity Clinic, interpreted by a doctor against the guideline-cited ranges above and tracked over time through your HodieLabs membership.

References

1. Savage DG, et al. Sensitivity of serum methylmalonic acid and total homocysteine determinations for diagnosing cobalamin and folate deficiencies. Am J Med. 1994;96:239–246.

This page is general information from the HodieLabs Evidence-Based Clinical Library, not medical advice. Speak with your GP about what testing and care is appropriate for you.