A patient prescribed 1000 mL of IV normal saline to run over 8 hours starts infusion at 0800. How much fluid will have infused by 1200?

To determine how much fluid will have infused by 1200, we first need to calculate the rate of infusion for the prescribed volume and time. The total volume of IV normal saline to be infused is 1000 mL over a time frame of 8 hours.

We can establish an infusion rate by taking the total volume and dividing it by the total time in hours:

1000 mL ÷ 8 hours = 125 mL per hour.

Next, we need to calculate the total fluid volume infused by the time of 1200, which is 4 hours after the infusion started at 0800. We multiply the infusion rate by the number of hours elapsed:

125 mL/hour × 4 hours = 500 mL.

Thus, by 1200, 500 mL of normal saline will have been infused. This calculation confirms that the correct answer is that the patient will have received 500 mL by 1200.