If a doctor's order states to infuse 300 mL of normal saline over 6 hours, what is the hourly infusion rate?

To find the hourly infusion rate, you can use the formula:

Hourly infusion rate = Total volume to be infused / Total time in hours.

In this case, the total volume is 300 mL, and the total time is 6 hours.

Calculating the hourly infusion rate:

Hourly infusion rate = 300 mL / 6 hours = 50 mL/hr.

This calculation accurately reflects the requirement to determine how much fluid is administered each hour over the given time frame. Therefore, the correct answer is 50 mL/hr.