A patient requires 250 mL of a solution over 2 hours. What is the required flow rate in mL/h?

A patient requires 250 mL of a solution over 2 hours. What is the required flow rate in mL/h?

• A. 120 mL/h
• B. 125 mL/h
• C. 130 mL/h
• D. 135 mL/h

Answer: (B)

Flow rate is found by dividing the total volume by the time over which it must be delivered. Here, 250 mL over 2 hours equals 250 ÷ 2 = 125 mL per hour. So the infusion should be set to 125 mL/h. For comparison, 120 mL/h would deliver 240 mL in 2 hours, 130 mL/h would deliver 260 mL, and 135 mL/h would deliver 270 mL in 2 hours, so 125 mL/h is the correct rate.

Flow rate is found by dividing the total volume by the time over which it must be delivered. Here, 250 mL over 2 hours equals 250 ÷ 2 = 125 mL per hour. So the infusion should be set to 125 mL/h. For comparison, 120 mL/h would deliver 240 mL in 2 hours, 130 mL/h would deliver 260 mL, and 135 mL/h would deliver 270 mL in 2 hours, so 125 mL/h is the correct rate.