antimitochondrial antibody test
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antimitochondrial antibody (AMA) test
a blood test that is used to determine the presence of antimicrobial antibody in the blood. Low titers may occur in chronic hepatitis, drug-induced hepatotoxicity, and various other diseases. High titers are often diagnostic of primary biliary cirrhosis. Patients with autoimmune hepatitis, extrahepatic obstruction, or acute infection may also test positive for AMA.