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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.
Millilitre | Milliliter. more ... A Metric unit of volume Equal to 1/1,000 (one-thousandth) of a liter Used for small amounts of liquid The abbreviation is ml or mL It takes about 20 drops (from a standard eye dropper) to make one mL This bottle can measure 2,000 ml (2 liters) in 250 ml increments. See: Litre | Liter. Metric Volume.