People who need a transfusion can get red blood cells from ordinary donors; it is easier to find and doesn’t require match ups. People with an excess do sometimes have supervised blood lettings that may involve donation if they don’t have other problems.
I know my red blood cell count went down very low during chemo, and I wasn’t given a transfusion. Blood transfusions have risks. Before they tested for HIV, hemophiliacs who receive concentrated blood products died in great numbers.
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