Anti-Cyclic Citrullinated Polypeptide Antibody is an indicator for the diagnosis of Rheumatoid Arthritis, the normal value is usually less than 5RU/ml, the specific value varies according to different testing methods, and you need to refer to the examination organization. Anti-cyclic citrullinated polypeptide antibody is a peptide fragment of cyclic polyfilament protein, which is widely used in the early diagnosis of rheumatoid arthritis. Positive antibody suggests a high likelihood of rheumatoid arthritis, and it also has obvious correlation with the condition of the rheumatoid arthritis patients, joint destruction, and prognosis of the prognosis of the regression of the rheumatoid arthritis patients, which greatly improves the diagnosis of the specificity of the diagnosis. Normal value is generally less than 5RU/ml, the specific value varies according to different testing methods, need to refer to the examination organization. It is recommended that patients with abnormal anti-cyclic citrullinated polypeptide antibodies should go to the hospital in time to get a clear diagnosis and follow the doctor’s instructions for treatment.