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Revista Brasileira de Reumatologia

Print version ISSN 0482-5004

Abstract

CALLADO, Maria Roseli Monteiro et al. Usefulness of anti-dsDNA antibody screening with chemiluminescence followed by confirmation by indirect immunofluorescence. Rev. Bras. Reumatol. [online]. 2013, vol.53, n.5, pp.412-418. ISSN 0482-5004.  https://doi.org/10.1590/S0482-50042013000500008.

OBJECTIVE: The purpose of this study was to evaluate the performance of a chemiluminescent immunoassay (CLIA) to detect anti-dsDNA antibodies, using the indirect immunofluorescence test (IIF) on Crithidia luciliae as a reference. METHODS: The automation system demonstrated 81% efficiency, 100% sensitivity and 82% specificity according to the intrinsic validation process performed using 179 consecutive samples from 169 patients in the beginning of 2011. These patients were subsequently divided into 3 groups according to the co-reactivity of anti-dsDNA results using the 2 methods (reactive, non-reactive and discrepant results). RESULTS: Upon data analysis, 77% (129/169) of the tests were requested by rheumatologists, and 57% (97/169) of the samples were from lupus patients. Both the reactive and non-reactive results of the CLIA were well defined and standardised, and automation reduced the manual labor required by 70% in a safe and high-quality manner. Furthermore, the high prevalence of patients with lupus and nephritis among the CLIA false-positive results corroborates the hypothesis that the actual index of CLIA false positivity is lower than that initially found in this study.

Keywords : Anti-dsDNA; Autoimmune diseases; Systemic lupus erythematosus; Chemiluminescence; Indirect immunofluorescence.

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