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Aim: The aim of this study was to compare the diagnostic values of laboratory variables, to present quantitative evaluations of the anti citrullinated protein / peptide antibody (ACPA), or anti CCP ( anti-cyclic citrullinated peptide, anti-CCP 2) antibodies in second generation antibody assay diagnostic test with reference to sensitivity and specificity, the predictive value of the positive and negative test and precision of the test for ACPA antibodies, rheumatoid factor, C-reactive protein and DAS 28 index, in the early diagnosis of untreated rheumatoid arthritis. Materials and methods: 70 participants (35 patients with rheumatoid arthritis not treated, 35 individuals as healthy controls) took part in the study. Their serum was examined using ELISA technology of DIA-STAT TM Anti-CCP (Axis–Shield Diagnostics). Rheumatoid factor was examined with the test for agglutination (Latex RF test). Results: We found the presence of ACPA antibodies (sensitivity of the test 65.71%) in 23 of the 35 examined patients with rheumatoid arthritis while rheumatoid factor appeared in 17 patients (sensitivity of the test 48.57%). Twelve patients were ACPA and rheumatoid factor positive, 11 were ACPA positive, but rheumatoid factor negative. Five patients were ACPA negative and rheumatoid factor positive. In 17 rheumatoid factor positive patients, ACPA antibodies were positive in 12 patients. Of 18 rheumatoid factor negative patients, 11 were ACPA positive. In the healthy control group, 1 patient was anti-CCP 2 positive, while 2 patients were rheumatoid factor positive. Conclusion: ACPA antibodies have higher sensitivity and specificity than rheumatoid factor in rheumatoid arthritis.

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Anti Citrullinated Protein / Peptide Antibody Assay, Rheumathoid Factor or Both as Shifted Test in Diagnostic and Prognostic Evaluation in Patients with Rheumathoid Arthritis