If an IV infusion is 1200 mL over 8 hours, what is the mL per hour rate?

• A. 100 mL/hour
• B. 150 mL/hour
• C. 180 mL/hour
• D. 200 mL/hour

Answer: (B)

Calculating IV flow rate involves dividing the total infusion volume by the infusion time. Here, 1200 mL over 8 hours equals 1200 ÷ 8 = 150 mL per hour. This means the IV should be delivered at 150 mL/hour to infuse the full 1200 mL within 8 hours. (In liters: 1.2 L over 8 hours is 0.15 L/hour, which is 150 mL/hour.)