The qualitative test for anti-CCP antibody should normally be negative, and the normal reference range for the quantitative test has not yet been determined. Anti-CCP antibody is anti-cyclic citrullinated peptide antibody, anti-cyclic citrullinated peptide antibody is a kind of autoantibody against citrullinated antigen, which is mainly found in patients with rheumatoid arthritis, and it can be used for the early diagnosis of rheumatoid arthritis, and it has high specificity and sensitivity, and anti-cyclic citrullinated peptide antibody can be categorized into qualitative and quantitative tests. Normal human anti-cyclic citrullinated peptide antibody qualitative test results should be negative, quantitative test of the normal reference range has not yet been determined, different quantitative test methods, anti-cyclic citrullinated peptide antibody of the normal reference range there are differences, generally based on the reference range of the test report issued by the testing organization. The anti-CCP antibody test report should be interpreted by a professional physician, and it is recommended that patients go to the Department of Rheumatology and Immunology of a regular hospital for detailed consultation.