ACPA/CP4-4

The ACPA/CP4-4 test used to detect anti-citrullinated protein antibodies (ACPA), which are linked to rheumatoid arthritis (RA). This test specifically looks for antibodies that target proteins modified by citrullination, a process often seen in people with RA. A positive result suggests the presence of RA or an increased risk of developing it. A negative result means these antibodies are not present, making RA less likely, but further testing may be needed to confirm the diagnosis. This test helps doctors diagnose rheumatoid arthritis and monitor how well treatments are working.