Objective Study the relationship between HLA antibodies production andthe number of Gravidity. Methods A total of 856 pregnant women of first pretanal in Xiasha Hospital of Sir Run Run Shaw Hospital of Zhejiang University from Nov 2016 to Mar 2017 were recruited.The blood samples were collected during 24-28 weeks of pregnancy,and the expression of platelet-specific alloantibody was detected by solid-phase red cell adherence assay. Results There were 67 positive HLA antibody in pregnant women,and the antibod...