How much Humulin R (U-100) is required to deliver 45 units?

To determine how much Humulin R (U-100) is needed to deliver 45 units, it is important to understand the concentration of the insulin. Humulin R (U-100) means that there are 100 units of insulin in every milliliter (ml) of solution.

To calculate the volume needed to deliver 45 units of Humulin R, the following formula is used:

Volume (ml) = Desired Units / Concentration (units/ml).

Plugging in the values:

Volume (ml) = 45 units / 100 units/ml = 0.45 ml.

This calculation shows that to achieve a delivery of 45 units of Humulin R (U-100), you would need to measure out 0.45 ml. This matches the correct choice provided, confirming the accurate dose calculation based on the concentration of the insulin solution.