Red blood cell specifications for patients with hemoglobinopathies: a systematic review and guideline.

The panel recommends that ABO D CcEe K-matched RBCs are selected for individuals with SCD and β-thalassemia, even in the absence of alloantibodies, to reduce the risk of alloimmunization. In patients with SCD and β-thalassemia who have developed clinically significant alloantibodies, selection of RBCs antigen negative to the alloantibody is recommended, if feasible. In these patients, selection of more extended phenotype-matched RBCs will likely reduce the risk of further alloimmunization. However, given the limited availability of extended phenotype-matched units, attention should be given to ensure that a delay in transfusion does not adversely affect patient care.