Abstract
Daratumumab (DARA), a monoclonal anti-CD38 antibody, belongs to the new generation of immunotherapy in refractory relapsed multiple myeloma. CD38 is weakly expressed on human erythrocytes. By its intrinsic anti-CD38 activity, DARA also interferes in routine pretransfusion compatibility testing such as antibody screening for red blood cells (RBCs) alloantibodies and compatibility testing. Treating RBCs with dithiothreitol eliminates the DARA interference. We report two cases of serological interference of DARA in pretransfusion testing and how timely information before starting the second patient on DARA prevented the delay in pretransfusion compatibility testing and blood availability.
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