The order is for 1000 mL D5/0.225% NS every 12 hours. How many mL per hour will the nurse set on the IV pump?

To determine the mL per hour that the nurse will set on the IV pump, we first need to calculate the total volume of fluid required over a 12-hour period. The order specifies an infusion of 1000 mL every 12 hours.

To find the rate per hour, we divide the total volume by the number of hours:

1000 mL / 12 hours = approximately 83.33 mL/hr.

When setting rates on an IV pump, it is common practice to round to the nearest whole number. In this case, 83.33 mL/hr rounds down to 83 mL/hr.

This reasoning supports the choice of 83 mL/hr as the correct answer.