Use of O RhD-negative red blood cells: A nationwide, prospective audit.

Background And Objectives: Despite declining transfusion rates, overuse of O RhD-negative red blood cells (RBCs) risks the secure supply of this limited resource. A nationwide prospective audit was performed in Finland to understand the clinical use and inventory management of O RhD-negative units. Our aim was to identify areas where policy changes could help alleviate the shortage of O RhD-negative RBCs.