Abstract: Objective To know the frequency of HLA antibodies in donors in Shanghai area, to provide basic data for the research on TRALI. Methods Samples of blood donors from October 2020 to April 2021 were randomly selected to detect HLA-specific antibodies by flow cytometry and microbead method, and the incidence of HLA antibodies was statistically analyzed. Results In 9 797 serum samples of blood donors, 1 715 (17.51%) were positive for HLA antibodies, among which the frequency of HLA antibodies in males and females was 4.81% and 28.08%. Excluding the history of blood transfusion, the frequency of HLA antibodies in women with no pregnancy history and women with pregnancy history was 12.10% and 36.62%, and comparative analysis the group of once, twice and three or more times pregnancies donors population, which frequency of HLA antibodies was 29.97%, 40.70% and 44.80%. The frequency of HLA antibodies in female donors with multiple pregnancy history was significantly higher than that in single pregnancy (P<0.05). Conclusion Consultation of pregnancy history and HLA antibodies detection of female blood donors in blood stations can prevent from the occurrence of TRALI.

Key words: Blood donors, HLA ClassⅠantibody, HLA Class Ⅱ antibody, HLA ClassⅠand Ⅱ antibodies, Transfusion-related acute lung injury