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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.
A U is a unit. 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.