When prescribed a continuous infusion of insulin at 3 units/hr, how should the infusion be set up if the solution consists of 100 units in 100 mL?

To determine how to set up a continuous infusion of insulin, it's essential to understand the concentration of the solution and the desired infusion rate. In this scenario, the insulin solution has a concentration of 100 units in 100 mL, which translates to 1 unit per mL.

If the prescribed infusion rate is 3 units/hour, you need to calculate the volume of the solution that corresponds to this dosage. Given that each milliliter contains 1 unit of insulin, an infusion rate of 3 units/hour would require an infusion of 3 mL/hour.

Setting the infusion at 3 mL/hour ensures that the patient receives the appropriate dose of insulin as prescribed. This is why the correct choice is to set the infusion at 3 mL/hr. The other choices would not deliver the correct amount of insulin based on the established concentration in the solution.