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Table 1 Sensitivity, specificity and positive predictive value of RF, anti-CCP and anti-RA33 autoantibodies in patients with very early RA

From: Autoantibodies in very early rheumatoid arthritis: diagnostic tools or pathogenic players?

  RA (n = 100) Non-RA (n = 80) Sensitivity (%) Specificity (%) Positive predictive value (%)
RF (≥ 20 U/ml) 54 9 54 89 86
RF (≥ 50 U/ml) 46 2 46 97 96
Anti-CCP 42 1 42 98 97
Anti-RA33 26 8 26 90 76
RF + anti-CCP 32 0 32 100 100
RF + RA33 15 0 15 100 100