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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 numbers 40 or 100 refer to how much insulin (the number of units) is in a set volume of fluid â which in this case is one milliliter. For example, U-100 has 100 units per milliliter and U-40 has 40 units per milliliter. It is possible to use a 1 ml (commonly referred to as a TB syringe) for insulin. So...U-100 insulin is more concentrated. There is essentially 2 Â½ times more insulin in a milliliter as compared to U-40.