An anti-smooth muscle antibody (ASMA) test is a blood test that is used to detect the presence of antibodies to smooth muscle in a person's blood. Smooth muscle is a type of muscle tissue that is found in the walls of organs and blood vessels, and it is responsible for controlling the movement of these structures. The presence of anti-smooth muscle antibodies in the blood can be a sign of a number of different autoimmune disorders, including autoimmune hepatitis and primary biliary cirrhosis. An ASMA test is often ordered as part of a routine medical examination or when a person is experiencing certain symptoms, such as fatigue or jaundice.
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