Usually ~300ml: Whole blood is collected from a donor, and the blood is then spun in a centrifuge to separate the red blood cells from the plasma and platelets. Transfusion volumes can vary quite a bit...One unit of red blood cells is typically around 300 milliliters (about 10 ounces); a bag of plasma or platelets is about 200 milliliters.
Answered 1/9/2014
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