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A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood.
How quickly is blood given? A unit (bag) of red blood cells usually takes two to three hours to give. If needed, a unit can be given more rapidly â for example, to treat severe bleeding. A unit of platelets or plasma is given in 30 to 60 minutes.