The Smooth Muscle Antibody also known as SMA or an actin antibody test is carried out when a person is diagnosed with autoimmune hepatitis. The primary aim of this test is to detect the antibodies that attack the smooth muscles. The attack on this muscle damages the immune system of the body. The autoimmune hepatitis are of two types; type 1 and type 2 respectively. The SMA test helps to differentiate between these two types. SMA test is usually carried out when a person experiences problems with liver. This test further helps to prevent the liver damage and damage to the smooth muscle tissues which in turn will restore the immune system of the patient.
