Rheumatoid arthritis (RA) is a chronic, inflammatory and autoimmune disease, there are many autoantibodies produced during disease progression in the patients' serum, and this work is to select a best detection scheme for RA diagnosis.
Autoantibody levels including rheumatoid factor (RF), anti-cyclic citrullinated peptide (CCP), mutated citrullinated vimentin (MCV), anti-keratin antibodies(AKA), anti-perinuclear factor (APF), and Ig heavy chain binding protein (BIP), were measured, and the sensitivity, specificity, predictive values, accuracy, and Youden's index of different combining forms were all calculated in RA patients, disease, and healthy control group. The differences in the positive rates of the three groups were compared between any two of them.
Generally speaking, the sensitivity of the autoantibodies detected in parallel combination was higher than that in tandem, which was more specific. The sensitivity of anti-MCV and RF calculated in parallel (87.61%) was obviously better than that of anyone autoantibody (P<.05), and only increased slightly even if more autoantibodies were tested in parallel (P>.05). The specificity of anti-CCP and BIP measured in tandem (95.92%) was obviously higher than that of anyone autoantibody (P<.05). While increasing the detected number of autoantibody from two kinds to three or more, the specificity was improved insignificantly (P>.05).
Anti-BIP and CCP antibodies detected in tandem combination can obtain higher specificity, and have good clinical value for the differential diagnosis of RA.