{"id":"anti-mitochondrial-m2","name":"Anti-Mitochondrial M2 Antibody","shortName":"Anti-M2","aliases":["AMA M2","Mitochondrial M2 Antibody","Anti-M2 Antibody","M2 Antibody (AMA)","Mitochondria M2 Ab IgG","Mitochondrial M2 Antibody, IgG (ELISA)","Mitochondrial (M2) Antibody, IgG","Anti-Mitochondrial M2 Ab","Anti-Mitochondrial M2 Antibody IgG","Antimitochondrial M2 Antibody","Mitochondrial M2 Ab"],"abbreviations":["AMA-M2"],"loinc":[{"code":"49781-8","primary":true},{"code":"14251-3","primary":false},{"code":"51715-1","primary":false},{"code":"26054-7","primary":false}],"specimen":"serum","units":[{"ucum":"[arb'U]/mL","display":"Units"}],"referenceRanges":[{"population":"Adults","low":0,"high":20,"unit":"[arb'U]/mL","unitDisplay":"Units","note":"Negative cutoff on the ARUP ELISA, reported in arbitrary Units: 20.0 or less is negative, 20.1 to 24.9 equivocal and 25.0 or more positive. ARUP prints its reference interval as 24.9 or less, which includes the equivocal zone. Kits use different scales for the same word 'Units': University of Iowa Hospitals reports an enzyme immunoassay with negative below 0.1 Units, borderline 0.1 to 0.3, weakly positive 0.4 to 0.9 and positive 1.0 or more. Cutoffs are specific to each kit and are not interchangeable, so use the cutoff and flag printed on your own report.","sources":[{"title":"Mitochondrial M2 Antibody, IgG (ELISA) (test 0050065)","url":"https://ltd.aruplab.com/Tests/Pub/0050065","publisher":"ARUP Laboratories"},{"title":"Mitochondrial Antibodies (M2)","url":"https://www.healthcare.uiowa.edu/Path_Handbook/handbook/test3543.html","publisher":"UI Health Care (University of Iowa Hospitals & Clinics) Laboratory Services Handbook"}]}],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"Antibodies against the M2 part of mitochondria, measured by ELISA. They are strongly linked to primary biliary cholangitis, a chronic bile duct condition of the liver.","url":"https://bloodtesttracker.com/markers/anti-mitochondrial-m2","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}