Charles Drew was instrumental in which area of transfusion medicine?

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Charles Drew’s impact in transfusion medicine was building the system for large-scale storage and distribution of blood components, especially plasma. He organized the collection, processing, and long-term storage of plasma, enabling it to be preserved and shipped for rapid transfusions. This work effectively established blood banks and the practice of providing plasma as a transfusion product on a large scale, which was crucial for wartime medical care and later for routine medical use.

The other areas mentioned belong to different aspects of clinical science: bacterial culture methods are microbiology, urine analysis is part of clinical chemistry and diagnostic testing, and coagulation testing of platelets relates to hemostasis and coagulation studies. None of these reflect Drew’s pioneering role in creating mass plasma storage and blood banking systems.