how much ml in 1 unit of prbc?
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.