When a patient receives an infusion of 500 mL over 4 hours, how many mL/hr is the infusion rate?

To determine the infusion rate in mL/hr when a patient receives an infusion of 500 mL over 4 hours, you need to calculate how much fluid is administered each hour. The formula for calculating the infusion rate is to divide the total volume of the infusion by the total number of hours it will run.

In this case, you take the total volume, 500 mL, and divide it by the duration of the infusion, which is 4 hours:

500 mL ÷ 4 hours = 125 mL/hr.

This calculation shows that the correct infusion rate is indeed 125 mL/hr, which is the rate at which the fluid should be administered over the specified time period. Understanding this formula and how to apply it is crucial for accurate medication administration in a clinical setting.