Infusion Calculations Practice Test

The nurse must infuse 800 mg over 6 hours. The solution is 100 mg per 5 mL. How many mL per hour?

6.67 mL/hr 5.0 mL/hr 8.0 mL/hr 10.0 mL/hr

Correct Answer:

6.67 mL/hr

Explanation:

To find the infusion rate, first convert the dose to the volume of fluid using the solution’s concentration, then divide by the infusion time. The solution has 100 mg in 5 mL, which is 20 mg per mL. To deliver 800 mg, you need 800 mg ÷ 20 mg/mL = 40 mL. Infusing 40 mL over 6 hours means the rate is 40 mL ÷ 6 h ≈ 6.67 mL per hour (about 6.7 mL/hr).

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