A 1000 mL bag of fluid is to be infused over 5 hours. What is the required flow rate in mL/h?

• A. 180 mL/h
• B. 190 mL/h
• C. 200 mL/h
• D. 210 mL/h

Answer: (C)

Flow rate is the amount of fluid delivered per unit of time. To deliver 1000 mL over 5 hours, divide the total volume by the time: 1000 mL ÷ 5 h = 200 mL/h. This rate means 200 mL would be given each hour, and over 5 hours you’d deliver 200 × 5 = 1000 mL.

For quick context, 180 mL/h would total 900 mL in 5 hours, 190 mL/h would be 950 mL, and 210 mL/h would be 1050 mL, so 200 mL/h is the correct flow rate.