The Anti-Nuclear Antibodies (ANA) test is a laboratory test used to detect the presence of antibodies that target components of the cell nucleus. This test is considered an important tool in diagnosing various autoimmune diseases, such as systemic lupus erythematosus and rheumatoid arthritis. Positive results indicate abnormal immune activity, helping doctors guide treatment and monitor the patient’s health. It is always recommended to interpret the results in conjunction with clinical symptoms and the patient’s medical history.