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Answer Wiki. One unit of packed red blood cells (PRBC) contains about 180 ml of actual RBC, and is 310 ml total (270-350 ml). PRBC will typically have a hematocrit of 57-58% (50-65%). (The unit of PRBC usually also still contains 30 ml of plasma (without coagulants), and 100 ml of Optisol.
Choose one answer. A. For every 3 mL of whole blood that is lost, the patient should be given 1 to 2 mL of PRBCs. B. In a patient with ongoing RBC loss, one unit of PRBCs will increase the hematocrit by about 5%. C. In general, the rate of administration of PRBCs should be proportional to the rate of blood cell loss.