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A and B antigen levels acquired by group O donor‐derived erythrocytes following ABO‐non‐identical transfusion or minor ABO‐incompatible haematopoietic stem cell transplantation

ABO‐incompatible haematopoietic stem cell transplantation (HSCT) presents a challenge to blood component transfusion. The aim of this study was to investigate the weak blood group A or B antigen expression by donor‐derived group O red blood cells (RBC) observed following transfusion or minor ABO‐incompatible HSCT. In addition, in vitro experiments were performed to elucidate possible mechanisms underlying this phenomenon.