A PHCP prescribes three liters of 0.9% saline to infuse over 24 hours. What is the infusion rate in mL per hour?

A PHCP prescribes three liters of 0.9% saline to infuse over 24 hours. What is the infusion rate in mL per hour?

• A. 100 mL/hr
• B. 125 mL/hr
• C. 150 mL/hr
• D. 175 mL/hr

Answer: (B)

Infusion rate equals the total volume to be infused divided by the time over which it’s given. Convert three liters to milliliters: 3 L = 3000 mL. Then divide by 24 hours: 3000 mL ÷ 24 h = 125 mL per hour. So the patient should receive 125 mL/hr. This rate delivers 3000 mL in 24 hours, matching the ordered amount. If you used 100 mL/hr, you’d deliver 2400 mL in 24 hours; at 150 mL/hr, you’d deliver 3600 mL in 24 hours—either under- or over-delivering relative to the prescription.

Infusion rate equals the total volume to be infused divided by the time over which it’s given. Convert three liters to milliliters: 3 L = 3000 mL. Then divide by 24 hours: 3000 mL ÷ 24 h = 125 mL per hour. So the patient should receive 125 mL/hr. This rate delivers 3000 mL in 24 hours, matching the ordered amount. If you used 100 mL/hr, you’d deliver 2400 mL in 24 hours; at 150 mL/hr, you’d deliver 3600 mL in 24 hours—either under- or over-delivering relative to the prescription.