Lab Test Interpreter

RF + Anti-CCP Interpreter

Enter your rheumatoid factor and anti-CCP results with symptoms to understand what they mean for RA diagnosis, false positive causes, next steps, and when to refer to rheumatology.

Serologic Results

Enter your RF and anti-CCP results

Rheumatoid Factor (RF)

IU/mL

Normal: typically less than 14 IU/mL. Low positive: 14-60. High positive: above 60.

Anti-CCP (Anti-Cyclic Citrullinated Peptide)

U/mL

Normal: typically less than 20 U/mL. High positive: above 3x ULN (greater than 60 U/mL at most labs).

RF + Anti-CCP Interpretation Report

RA Probability

▪ Differential Probability

▸ Clinical Interpretation

△ Recommended Next Steps

▲ False Positive Assessment

False positive probability

◈ Referral Guidance

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For educational and clinical support purposes only. RF has a sensitivity of approximately 70% and specificity of 78% for RA. Anti-CCP has sensitivity of 67% and specificity of 95%. These probabilities are qualitative estimates, not validated predictive models. Written by Mahiar Rabie, MS, MD.