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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.
One PRBC unit will raise the hematocrit of a standard adult patient by 3% (or about 1%/mL/kg in a child - 12%/25 kg with the standard 300 mL PRBC unit). PRBCs are used to replace red cell mass when tissue oxygenation is impaired by acute or chronic anemia. FFP contains all factors of the soluble coagulation system, including the labile factors V and VIII. FFP is indicated when a patient has MULTIPLE factor deficiencies and is BLEEDING.