The screening assay of platelet-associated immunoglobulin G can not improve the sensitivity of monoclonal antibody immobilization of platelet antigens assay in immune thrombocytopenic purpura
- VernacularTitle:血小板相关抗体IgG初筛不能提高单克隆抗体特异性俘获血小板抗原对免疫性血小板减少性紫癜诊断的敏感性
- Author:
Cui-Hua YI
;
Ming HOU
;
Yuan-Yuan ZHU
;
Ping QIN
;
- Publication Type:Journal Article
- Keywords:
Purpura,thrombocytopenic,idiopathic;
Antibodies;
Diagnosis;
Screening
- From:
Chinese Journal of Laboratory Medicine
2001;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate if the assay of platelet-associated immunoglobulin G (PAIgG) can improve the sensitivity of monoclonal antibody immobilization of platelet antigens assay (MAIPA) in immune thrombocytopenic purpura (ITP).Methods Anti-GP Ⅱb/Ⅲa and anti-GP Ⅰb/Ⅸ autoantibodies were detected by a modified MAIPA;PAIgG was detected by competitive ELISA.MAIPA and PAIgG were done simultaneously in 190 patients with thrombocytopenia,in which 132 were diagnosed as ITP according to the diagnostic criteria Kappa test was used to analyze the concordance between MAIPA and PAIgG.Results The sensitivities of PAIgG alone or in parallel with MAIPA to ITP were 32.6% and 37.2% higher than MAIPA alone respectively,while their specifieities were 51.7% and 56.9% lower respectively.The sensitivity,specificity,positive predictive value,negative predictive value of PAIgG in series with MAIPA were all not superior to MAIPA alone.The kappa values between MAIPA and PAIgG in ITP and non-immune thrombocytopenia were 0.129 and 0.012 respectively,which meant the concordance between them was poor.Conclusion The detection of PAIgG should not be used as screening before MAIPA in distinguishing immune from non-immune thrombocytopenia.
