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Phenotyping autologous red cells within 1 day after allogeneic blood transfusion by using immunomagnetic isolation of reticulocytes

Background: When a transfused patient develops multiple or weak blood group antibodies, posttransfusion phenotyping is useful in antibody identification. To perform a correct phenotyping after transfusion, isolation of autologous red cells is necessary. However, mature autologous red cells are impossible to separate from their donor counterparts. Since the proportion of autologous reticulocytes compared to donor reticulocytes increases rapidly after transfusion, selective isolation of reticulocytes provides autologous cells for antigen typing.