Units per hour to mL/hr 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
Order: heparin 840 units/hr IV. Available: heparin 12,500 units in 250 mL. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
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Answer: 16.8 mL/hr
- Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
- mL/hr = 840 units/hr ÷ 50 units/mL = 16.8 mL/hr.
- 16.8 mL/hr is exact, so no rounding is needed.
Problem 2
The nurse is caring for a client who has a prescription for heparin 1,330 units/hr IV. The nurse has heparin 25,000 units in 250 mL available. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
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Answer: 13.3 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,330 units/hr ÷ 100 units/mL = 13.3 mL/hr.
- 13.3 mL/hr is exact, so no rounding is needed.
Problem 3
The nurse is caring for a client who has a prescription for heparin 910 units/hr IV. The nurse has heparin 12,500 units in 250 mL available. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
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Answer: 18.2 mL/hr
- Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
- mL/hr = 910 units/hr ÷ 50 units/mL = 18.2 mL/hr.
- 18.2 mL/hr is exact, so no rounding is needed.
Problem 4
The nurse is caring for a client who has a prescription for heparin 1,320 units/hr IV. The nurse has heparin 25,000 units in 250 mL available. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
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Answer: 13.2 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,320 units/hr ÷ 100 units/mL = 13.2 mL/hr.
- 13.2 mL/hr is exact, so no rounding is needed.
Problem 5
The nurse is caring for a client who has a prescription for heparin 1,310 units/hr IV. The nurse has heparin 25,000 units in 250 mL available. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
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Answer: 13.1 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,310 units/hr ÷ 100 units/mL = 13.1 mL/hr.
- 13.1 mL/hr is exact, so no rounding is needed.
Problem 6
A client with a clotting disorder is admitted to the telemetry unit and needs continuous anticoagulation. The prescriber orders heparin 990 units/hr IV. The pharmacy sends heparin 25,000 units in 250 mL for the infusion. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
Show answer and steps
Answer: 9.9 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 990 units/hr ÷ 100 units/mL = 9.9 mL/hr.
- 9.9 mL/hr is exact, so no rounding is needed.
Problem 7
Order: heparin 1,260 units/hr IV. Available: heparin 25,000 units in 250 mL. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
Show answer and steps
Answer: 12.6 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,260 units/hr ÷ 100 units/mL = 12.6 mL/hr.
- 12.6 mL/hr is exact, so no rounding is needed.
Problem 8
A client with a suspected pulmonary embolism is receiving continuous anticoagulation therapy in the telemetry unit. The prescription reads: heparin 1,480 units/hr IV. The pharmacy supplies heparin 25,000 units in 250 mL. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
Show answer and steps
Answer: 14.8 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,480 units/hr ÷ 100 units/mL = 14.8 mL/hr.
- 14.8 mL/hr is exact, so no rounding is needed.
Problem 9
A client with a pulmonary embolism is receiving continuous anticoagulation therapy in the intensive care unit. Prescribed: heparin 1,230 units/hr IV. Available: heparin 25,000 units in 250 mL. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
Show answer and steps
Answer: 12.3 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,230 units/hr ÷ 100 units/mL = 12.3 mL/hr.
- 12.3 mL/hr is exact, so no rounding is needed.
Problem 10
The nurse is caring for a client who has a prescription for heparin 1,430 units/hr IV. The nurse has heparin 25,000 units in 250 mL available. At how many mL/hr should the nurse set the infusion pump? Record your answer using 1 decimal place.
Show answer and steps
Answer: 14.3 mL/hr
- Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
- mL/hr = 1,430 units/hr ÷ 100 units/mL = 14.3 mL/hr.
- 14.3 mL/hr is exact, so no rounding is needed.
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