A patient needs 900 mL of intravenous fluid over 6 hours. What is the required flow rate in mL/h?

A patient needs 900 mL of intravenous fluid over 6 hours. What is the required flow rate in mL/h?

• A. 140 mL/h
• B. 145 mL/h
• C. 155 mL/h
• D. 150 mL/h

Answer: (D)

The key idea is calculating flow rate by dividing the total volume to be infused by the time over which it should be given. 900 mL over 6 hours equals 900 ÷ 6 = 150 mL per hour. So the required flow rate is 150 mL/h. This rate delivers exactly 900 mL in 6 hours. Quick checks: at 140 mL/h you’d give 840 mL in 6 hours; at 145 mL/h you’d give 870 mL; at 155 mL/h you’d give 930 mL. The 150 mL/h option matches the required amount.

The key idea is calculating flow rate by dividing the total volume to be infused by the time over which it should be given. 900 mL over 6 hours equals 900 ÷ 6 = 150 mL per hour. So the required flow rate is 150 mL/h. This rate delivers exactly 900 mL in 6 hours. Quick checks: at 140 mL/h you’d give 840 mL in 6 hours; at 145 mL/h you’d give 870 mL; at 155 mL/h you’d give 930 mL. The 150 mL/h option matches the required amount.