{"id":"methylmalonic-acid","name":"Methylmalonic Acid (MMA), Serum","shortName":"Serum MMA","aliases":["Methylmalonic Acid","Methylmalonic Acid, Serum","Methylmalonate","Methylmalonic Acid, Quantitative","MMA, Serum","Serum MMA","Ácido metilmalónico","Methylmalonsäure","Methylmalonic Acid, Plasma","Methylmalonic Acid, Serum or Plasma","Methylmalonic Acid, Quantitative, Serum","Methylmalonic Acid Level","Serum Methylmalonic Acid","Methylmalonic Acid (MMA)"],"abbreviations":[],"loinc":[{"code":"13964-2","primary":true},{"code":"2629-4","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"nmol/L","display":"nmol/L"},{"ucum":"umol/L","display":"µmol/L"},{"ucum":"nmol/mL","display":"nmol/mL"}],"referenceRanges":[{"population":"60–79","low":69,"high":390,"unit":"nmol/L","unitDisplay":"nmol/L","sources":[{"title":"Methylmalonic Acid (test 34879)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/34879/methylmalonic-acid?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"80+","low":85,"high":423,"unit":"nmol/L","unitDisplay":"nmol/L","sources":[{"title":"Methylmalonic Acid (test 34879)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/34879/methylmalonic-acid?cc=MASTER","publisher":"Quest Diagnostics"}]}],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"Measures methylmalonic acid, a substance that builds up in your blood when your cells do not get enough usable vitamin B12.","url":"https://bloodtesttracker.com/markers/methylmalonic-acid","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}