Whole blood is made up of 3 parts - red blood cells, plasma and a Buffy coat which contains white blood cells and platelets.
The Complete Blood Count test measures the percentage of packed red blood cells in a whole blood sample.
hematocrit
Hematocrit test measures the percentage by volume of packed red blood cells in a whole blood sample. It is used to evaluate the concentration of red blood cells in the blood and can help diagnose conditions such as anemia or dehydration.
Kinds of blood to be transfuse are packed RBC, fresh whole blood and plasma.
It's where you give someone red blood cells essentially. They get whole blood from donors and remove everything except the rbcs, giving you concentrated rbc.
Packed red cells are prepared by removing most of the plasma from whole blood through a process called centrifugation. This centrifugation process separates the red blood cells from the plasma and other cellular components, resulting in a concentrated suspension of red blood cells. The packed red cells are then typically suspended in a small amount of saline solution before being transfused to a patient.
Packed red blood cells (PRBCs), also called "packed cells," are a preparation of red blood cells that are transfused to correct low blood levels. A unit of PRBCs begins as a 450 milliliter volume of whole blood. Platelets and plasma are removed to leave a preparation of 220 milliliters of mostly red blood cells. This step concentrates the red blood cells so that they occupy less space, thus the term "packed." One unit of PRBCs typically will raise the hematocrit by 3-4% and the blood hemoglobin concentration by 1 gm/dl. PRBCs last in refrigeration for up to 42 days, but under the right conditions, they can be frozen for up to a decade.
Typically when people refer to a blood bag they mean a transfusion of packed red blood cells. A transfusion of one unit of packed red blood cells would be approximately 250 mL.
Hematocrit measures the volumeof packed RBCs as a percentage of blood volume.
There is an interesting relationship between plasma and whole blood. Whole blood contains plasma but plasma does not contain whole blood.
Packed Red Blood Cells
packed cell volume (PCV)