Autoimmune diseases cause the body to attack itself, which leads to inflammation and results in damage to muscles, tissues, and organs. The body produces antibodies specific to each autoimmune disease; the antibody levels measured in your blood are then used by your doctor to diagnose the disease that is causing your symptoms. ANA is a blood test that is mainly used to diagnose SLE (systemic lupus erythmatosis) and other autoimmune diseases. There are many ANA subtests, and each test is specific to a certain autoimmune disease. High ANA blood levels are also seen in people with cirrhosis, chronic hepatitis, leukemia, and mononucleosis.
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