Authors: Yan Ye Zhigang Hu Jie Liu Guoqian Chen Yaohong Zhou Lei Yu
Publish Date: 2012/06/10
Volume: 31, Issue: 9, Pages: 1339-1345
Abstract
In an effort to improve the quantitative detection of anticardiolipin antibodies aCL IgG so as to classify patients correctly as antiphospholipid syndrome APS positive we developed a new immunoassay based on a sandwich timeresolved fluoroimmunoassay TRFIA using the complex of cardiolipin plus bovine β2GPI as antigen and Eu3+labeled rabbit antihuman IgG as conjugate The precision sensitivity specificity and stability of the assay were evaluated and comparison with the classical ELISA was also made The aCL IgG TRFIA kit we established had a wider detectable range than three commercial ELISA ones from different manufacturers when a specimen was diluted with strong positive result from 1125 to 1204800 The average intraassay and interassay CVs detected by the aCL IgG TRFIA was 314 and 370 respectively The sensitivity was 01 GPL U/ml and the clinical diagnostic specificity was 98 The established assay kit also behaved better in stability than the commercial ELISA ones Additionally the immunoassay we established correlated well with the ELISA and the correlation coefficient was 0975 We thus conclude that the TRFIA we developed for aCL IgG detection gives promise to a more sensitive and reliable diagnosis of APS and has potential value for largescale screening programs
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