Antinuclear antibody 200 clinically generally refers to an antinuclear antibody titer of 1:200, indicating that the patient’s antinuclear antibody test results are positive and that connective tissue disease may be present in the body. Antinuclear antibody is usually expressed as ANA, which is a specific antibody produced by the human body and is usually seen in various connective tissue diseases, such as systemic lupus erythematosus, dry syndrome, ankylosing spondylitis, etc. The normal range of ANA is 1:200, which means that the patient’s test result is positive. Clinically, the normal range value of ANA is a titer of less than 1:10. When the ANA result is 1:200, it means that the result is positive, and connective tissue disease may exist in the body, which requires further examination and the combination of clinical symptoms for disease diagnosis. When the patient’s antinuclear antibody is 1:200, it is recommended to go to the hospital in time and follow the doctor’s instructions for further examination.