The **Anti-CCP (Anti-Cyclic Citrullinated Peptide) test** is a highly specific blood test used primarily to diagnose **Rheumatoid Arthritis (RA)**. It detects autoantibodies that mistakenly target citrullinated proteins, which are formed during joint inflammation.
With a specificity of over 95%, a positive result strongly indicates RA, helping physicians differentiate it from other forms of arthritis early in the disease course. Furthermore, elevated anti-CCP levels are strong prognostic indicators, often predicting a more aggressive, erosive form of joint damage. Early detection via this panel allows for timely therapeutic intervention, significantly improving long-term joint outcomes.