Antiactin Antibody (Smooth Muscle) and Antimitochondrial M2 Antibody
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Synonym/Acronym:
Antiactin antibody, ASMA; mitochondrial M2 antibody, M2 antibody, AMA.
Rationale
To assist in the differential diagnosis of chronic liver disease, typically biliary cholangitis.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
Method: Immunoassay, enzyme-linked immunosorbent (ELISA).
| Negative | Less than 20 units |
| Weak positive | 20–30 units |
| Positive | Greater than 30 units |
| Negative | Less than 20 units |
| Weak positive | 20.1–24.9 units |
| Positive | Greater than 25 units |
Critical Findings and Potential Interventions
N/A
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