A 250 mL IV bag to be infused over 15 minutes. What is the required flow rate in mL/h?

A 250 mL IV bag to be infused over 15 minutes. What is the required flow rate in mL/h?

• A. 1000 mL/h
• B. 900 mL/h
• C. 1100 mL/h
• D. 950 mL/h

Answer: (A)

Flow rate is how many milliliters are delivered in one hour. To convert from minutes to hours, use: mL/h = (mL) / (minutes) × 60. Here, 15 minutes is 0.25 hours, so the rate = 250 mL / 0.25 h = 1000 mL/h. Equivalently, since a quarter-hour delivers 250 mL, multiplying by four to fill an hour gives 1000 mL/h. If the rate were slower, the bag would take longer than 15 minutes; if faster, it would take less than 15 minutes. For example, a rate just below 1000 mL/h would take a bit longer than 15 minutes, while a rate just above would finish sooner. Only 1000 mL/h matches the 15-minute infusion exactly.

Flow rate is how many milliliters are delivered in one hour. To convert from minutes to hours, use: mL/h = (mL) / (minutes) × 60. Here, 15 minutes is 0.25 hours, so the rate = 250 mL / 0.25 h = 1000 mL/h. Equivalently, since a quarter-hour delivers 250 mL, multiplying by four to fill an hour gives 1000 mL/h. If the rate were slower, the bag would take longer than 15 minutes; if faster, it would take less than 15 minutes. For example, a rate just below 1000 mL/h would take a bit longer than 15 minutes, while a rate just above would finish sooner. Only 1000 mL/h matches the 15-minute infusion exactly.