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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.
Using ratio 100 units per mL (100U/mL), we need to convert 90 units into mL: x / 90U = 1mL / 100U x = (90U * 1mL) / 100U x = (90 / 100)mL x = 0.9 mL The patient will inject 0.9 mL daily. In this case, the total days supply will be 20 mL divided by 0.9 mL which is 22 days.