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- Title
Výhody stanovení protilátek proti myeloperoxidáze a proteináze-3 chemiluminiscenční metodou u pacientů s ANCA asociovanou vaskulitidou.
- Authors
I., Francová; Z., Hrušková; K., Malíčková; H., Lahoda Brodská; V., Tesař; T., Zima
- Abstract
Objective: To verify diagnostic sensitivity and specificity of the novel chemiluminescence method for the detection of the autoantibodies against myeloperoxidase (anti-MPO) and proteinase 3 (anti-PR3). To compare this method with commonly used enzyme linked immunoassays (ELISA) and evaluate the mutual agreement of the methods with indirect immunofluorescence method (IIF). To assess the utility of chemiluminescent immunoassay (CLIA) as a screening test for ANCA associated vasculitis (AAV) patients. Design: retrospective Materials and Methods: Sera of 101 patients with AAV with kidney involvement were tested for presence of anti-MPO and anti-PR3 by three detection systems - CLIA, 1st generation ELISA of two producers and by IIF for presence of ANCA. Results: Diagnostic sensitivity and specificity of the CLIA for anti-MPO was 91.7% and 100%, for anti-PR3 it was 96.2% and 100%, respectively. Our study didn't show mutual quantitative agreement between methods for their whole measurement range, the quantitative difference between methods is increasing in favour of CLIA with the increasing concentration of the antibodies. Highest total qualitative agreement was found between IIF and CLIA, for both observed autoantibodies, anti-MPO (91.9%) and anti-PR3 (90.6%). The moderate strength of agreement was found only between CLIA and IIF (kappa = 0.455 for anti-MPO and kappa = 0.410 for anti-PR3) by Cohen kappa analysis. Conclusion: We have verified the sensitivity and specificity values of the novel chemiluminescence method and the results obtained in our group of patients were applicable in agreement with manufacturer's data. We have demonstrated higher diagnostic sensitivity for CLIA compared to common used ELISAs for both observed autoantibodies. We have also demonstrated acceptable strength of qualitative agreement between CLIA and IIF. The suitability of the CLIA for the ANCA screening and for the routine laboratory ANCA testing was proven. The great advantage of CLIA compared to ELISA is much shorter time of testing and the random access, which all make CLIA suitable for the testing in statim mode.
- Publication
Klinická Biochemie a Metabolismus, 2018, Vol 26, Issue 3, p119
- ISSN
1210-7921
- Publication type
Article