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Immune thrombocytopenic purpura is an acquired disorder, in which accelerated platelet consumption is due to platelet autoantibodies. The aim of this study was to investigate the clinical value of platelet autoantibodies assay in children with ITP and to evaluate flow cytometry in the detection of platelet autoantibodies in comparison with monoclonal antibody specific immobilization of platelet antigen (MAIPA) assay. We measured platelet autoantibodies by flow cytometry and MAIPA in 18 children with ITP (6 acute, 7 chronic and 5 in remission), in addition to 5 healthy children with matched age and sex as a control group. Significant elevation of platelet-associated immunoglobulin G (PAIgG), PAIgM and PAIgA was demonstrated in children with acute ITP compared to controls and children with chronic ITP (P &lt; 0.05). There was significant elevation of PAIgG and PAIgM in children with acute ITP compared to children with ITP in remission (P &lt; 0.05). There was significant negative correlation between platelet count and PAIgG levels in ITP children (r = -0.717; P = 0.001). Flow cytometry found PAIgG in 94.4% of ITP children. MAIPA has detected platelet specific IgG autoantibodies in 83.3% of ITP children. ROC analysis revealed sensitivity of 94%, specificity of 57% with overall accuracy of 83% for detection of PAIgG by flow cytometry compared to MAIPA.

Flow cytometry detection of platelets autoantibodies in children with idiopathic thrombocytopenic purpura