Plasma is the liquid component of blood. It is produced by taking whole blood and, by using a centrifuge, separating out the red blood cells, white blood cells and antibodies.

Plasma has advantages over both a whole blood transfusion and using intravenous saline. Unlike whole blood, it does not have to be typed before a transfusion. It also stores for longer periods than whole blood. Unlike saline, it is likely not to displace blood cells or put additional stress on the kidneys.

Blood plasma at Wikipedia

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