Rheumatoid Arthtitis (RA) is a common systemic autoimmune disease, which currently affects 1-2% of the world's population. The diagnosis of rheumatoid arthritis currently mainly depends on clinical symptoms. The only serological test to determine whether the serum contains rheumatoid factors. Anti-CCP antibody can be detected before RA patients have obvious joint damage, and the antibody has a very good positive predictive value. Anti-CCP antibody is a highly specific serological indicator for detecting rheumatoid arthritis (RA). It can be used for early diagnosis of RA, efficacy monitoring and prognostic evaluation. The anti-cyclic citrullinated peptide antibody assay kit developed by our company is based on highly purified synthetic peptides containing citrulline residues. It is a valuable auxiliary diagnostic indicator in the diagnosis of rheumatoid arthritis (for reference only).