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Clinical significance of ELISA positive and immunofluorescence negative anti-dsDNA antibody. | LitMetric
Background : Positivity for anti-dsDNA antibody is a diagnostic criterion of systemic lupus erythematosus (SLE). In the present study, the significance of ELISA positive and Crithidia luciliae immunofluorescence test (CLIFT) negative anti-dsDNA sera was evaluated.Methods : There were 371 consecutive serum samples submitted to for anti-dsDNA testing that were assayed using anti-dsDNA ELISA and CLIFT. Sera showing discrepant results were collected and then examined using 3 commercial anti-dsDNA and anti-ssDNA ELISA kits and by Farr assay. Medical records were reviewed for those patients who were ELISA positive and CLIFT negative for anti-dsDNA.Results : Fifty-two patients of 100 anti-dsDNA ELISA positive patients were negative by CLIFT. For ELISA positive and CLIFT negative sera, Farr assays showed the highest positive rate (72.7%) for the 4 different anti-dsDNA assays (3 commercial kits and the Farr assay). Nearly 80% of 44 ELISA positive and CLIFT negative patients met >or=3 of the SLE classification criteria (excluding the anti-dsDNA criterion).Conclusion : Some anti-dsDNA ELISA kits have diagnostic efficiencies that are similar to that of the Farr assay. Moreover, the study identifies a group of patients that are ELISA positive but CLIFT negative for anti-dsDNA, and indicates that the majority of these patients have clinically relevant SLE.
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