A male patient is receiving dextrose 5% at 55 mL/h. How much fluid will he receive in 2 hours?

• A. 105 mL
• B. 100 mL
• C. 115 mL
• D. 110 mL

Answer: (D)

The key idea is to calculate total fluid by multiplying the infusion rate by the time the infusion runs. The patient receives 55 mL per hour, and over 2 hours that’s 55 mL/h × 2 h = 110 mL. So, 110 mL of fluid will be given in 2 hours. This approach stays the same whenever either the rate or the time changes. For reference, 100 mL would come from 50 mL/h for 2 hours, 105 mL would come from 52.5 mL/h for 2 hours, and 115 mL would come from 57.5 mL/h for 2 hours.