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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.
The maximum blood volume may be divided by the number of blood collections needed in a given two-week time period in order to determine the blood volume per collection point. For example, 0.25 ml (250Âµl) from a 25 gram mouse may be collected as: