Infusion Calculations Practice Test

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A drug order is 1000 mg to be given over 6 hours. The solution concentration is 500 mg per 5 mL. What is the infusion rate in mL/hr?

1.67 mL/hr

Start with the idea that you convert the prescribed dose to the actual volume using the solution’s concentration, then divide that volume by the time to get the infusion rate in mL per hour.

The concentration is 500 mg in 5 mL, which is 100 mg per mL. To deliver 1000 mg, you need 1000 mg ÷ 100 mg/mL = 10 mL total. Infusing 10 mL over 6 hours gives a rate of 10 mL ÷ 6 h = 1.667 mL/h, about 1.67 mL/hr.

So the infusion rate is 1.67 mL/hr.

0.83 mL/hr

3.33 mL/hr

5.0 mL/hr

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