Infusion time practice problems
Work each problem on paper first, rounding as the question says. Then open the answer to check it and see every step.
For study and exam practice, not for patient care. The orders in these problems are written for practice. In the clinic, follow the prescriber's order, your facility's protocols, and your pharmacy.
Problem 1
A bag of 0.45% sodium chloride 1,000 mL is infusing at 80 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 12.5 hours
- Hours = volume ÷ rate.
- 1,000 mL ÷ 80 mL/hr = 12.5 hours.
- 12.5 hours is exact, so no rounding is needed.
Problem 2
Order: 0.9% sodium chloride 1,000 mL IV to infuse at 90 mL/hr. Available: 0.9% sodium chloride 1,000 mL bag, infusing by pump. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 11.1 hours
- Hours = volume ÷ rate.
- 1,000 mL ÷ 90 mL/hr = 11.11 hours.
- Round to the nearest tenth: 11.1 hours.
Problem 3
The nurse is caring for a client who has a bag of 0.45% sodium chloride 500 mL hanging on an IV pump. The bag is infusing at 120 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 4.2 hours
- Hours = volume ÷ rate.
- 500 mL ÷ 120 mL/hr = 4.17 hours.
- Round to the nearest tenth: 4.2 hours.
Problem 4
Order: 0.45% sodium chloride 1,000 mL IV to infuse at 120 mL/hr. Available: 0.45% sodium chloride 1,000 mL bag, infusion pump set at 120 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 8.3 hours
- Hours = volume ÷ rate.
- 1,000 mL ÷ 120 mL/hr = 8.33 hours.
- Round to the nearest tenth: 8.3 hours.
Problem 5
The nurse is caring for a client who has a bag of 0.9% sodium chloride 1,000 mL infusing at 180 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 5.6 hours
- Hours = volume ÷ rate.
- 1,000 mL ÷ 180 mL/hr = 5.56 hours.
- Round to the nearest tenth: 5.6 hours.
Problem 6
A bag of 0.45% sodium chloride 500 mL is infusing at 180 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 2.8 hours
- Hours = volume ÷ rate.
- 500 mL ÷ 180 mL/hr = 2.78 hours.
- Round to the nearest tenth: 2.8 hours.
Problem 7
Order: 0.9% sodium chloride 1,000 mL IV to infuse at 140 mL/hr. Available: 0.9% sodium chloride 1,000 mL bag, to be hung by the nurse for this client. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 7.1 hours
- Hours = volume ÷ rate.
- 1,000 mL ÷ 140 mL/hr = 7.14 hours.
- Round to the nearest tenth: 7.1 hours.
Problem 8
The nurse is caring for a client who has a bag of lactated Ringer's solution 500 mL hanging on an intravenous pump. The bag is infusing at 140 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 3.6 hours
- Hours = volume ÷ rate.
- 500 mL ÷ 140 mL/hr = 3.57 hours.
- Round to the nearest tenth: 3.6 hours.
Problem 9
Order: 0.45% sodium chloride 500 mL to infuse at 60 mL/hr. Available: 0.45% sodium chloride 500 mL. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 8.3 hours
- Hours = volume ÷ rate.
- 500 mL ÷ 60 mL/hr = 8.33 hours.
- Round to the nearest tenth: 8.3 hours.
Problem 10
The nurse is caring for a client who needs ongoing hydration and calorie support through an intravenous line. A bag of 5% dextrose in water 500 mL is infusing at 140 mL/hr. How many hours will the infusion take to complete? Record your answer using 1 decimal place.
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Answer: 3.6 hours
- Hours = volume ÷ rate.
- 500 mL ÷ 140 mL/hr = 3.57 hours.
- Round to the nearest tenth: 3.6 hours.
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