What is the sensitivity and specificity of anti-CCP for RA?

Anti-CCP sensitivity 60-75%, specificity >95% for RA. High-positive anti-CCP has ~98% specificity. Anti-CCP can be positive years before clinical RA (preclinical RA). IgG anti-CCP2 is the most widely used assay.

Does anti-CCP predict radiographic damage?

Yes. Seropositive RA (especially double-positive anti-CCP + RF at high titer) is associated with more rapid radiographic progression, greater functional loss, and extraarticular manifestations compared to seronegative RA.

Can anti-CCP be positive without RA?

Anti-CCP can be positive in other diseases: psoriatic arthritis (~5%), undifferentiated arthritis, rarely SLE or SS. Isolated anti-CCP positivity without arthritis is not diagnostic of RA but warrants monitoring.

Anti-CCP and Rheumatoid Factor Diagnostic Utility

Calculate pre- and post-test probability of rheumatoid arthritis using anti-CCP and rheumatoid factor results. Anti-CCP has 95% specificity; high-positive anti-CCP (>3× ULN) with high-titer RF indicates high RA likelihood and radiographic progression risk.

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Anti-CCP and Rheumatoid Factor Diagnostic Utility

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Frequently Asked Questions

What is the sensitivity and specificity of anti-CCP for RA?

Does anti-CCP predict radiographic damage?

Can anti-CCP be positive without RA?