mL/hr to units per hour practice problems

IV Flow Rate · 10 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.

1. Problem 1

   The nurse is caring for a client with a continuous heparin infusion. The bag of heparin 12,500 units in 250 mL is infusing at 31.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

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   Answer: 1,575 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 31.5 mL/hr × 50 units/mL = 1,575 units/hr.
   3. 1,575 units/hr is exact, so no rounding is needed.

2. Problem 2

   Order: heparin infusion. Available: heparin 12,500 units in 250 mL bag, infusing at 21.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 1,075 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 21.5 mL/hr × 50 units/mL = 1,075 units/hr.
   3. 1,075 units/hr is exact, so no rounding is needed.

3. Problem 3

   A bag of heparin 12,500 units in 250 mL is infusing at 18.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

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   Answer: 925 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 18.5 mL/hr × 50 units/mL = 925 units/hr.
   3. 925 units/hr is exact, so no rounding is needed.

4. Problem 4

   Order: heparin infusion. Available: heparin 12,500 units in 250 mL bag, infusing at 29.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 1,475 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 29.5 mL/hr × 50 units/mL = 1,475 units/hr.
   3. 1,475 units/hr is exact, so no rounding is needed.

5. Problem 5

   A bag of heparin 25,000 units in 250 mL is infusing at 8.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 850 units/hr

   1. Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
   2. units/hr = 8.5 mL/hr × 100 units/mL = 850 units/hr.
   3. 850 units/hr is exact, so no rounding is needed.

6. Problem 6

   Order: heparin infusion. Available: heparin 12,500 units in 250 mL bag, infusing at 28.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 1,425 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 28.5 mL/hr × 50 units/mL = 1,425 units/hr.
   3. 1,425 units/hr is exact, so no rounding is needed.

7. Problem 7

   A bag of heparin 12,500 units in 250 mL is infusing at 19.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 975 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 19.5 mL/hr × 50 units/mL = 975 units/hr.
   3. 975 units/hr is exact, so no rounding is needed.

8. Problem 8

   The nurse is caring for a client who has a deep vein thrombosis and is receiving a continuous infusion through a central line. A bag of heparin 25,000 units in 250 mL is infusing at 13.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 1,350 units/hr

   1. Concentration = 25,000 units ÷ 250 mL = 100 units/mL.
   2. units/hr = 13.5 mL/hr × 100 units/mL = 1,350 units/hr.
   3. 1,350 units/hr is exact, so no rounding is needed.

9. Problem 9

   A bag of heparin 12,500 units in 250 mL is infusing at 32.5 mL/hr. How many units/hr is the client receiving? Record your answer using a whole number.

   Show answer and steps

   Answer: 1,625 units/hr

   1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
   2. units/hr = 32.5 mL/hr × 50 units/mL = 1,625 units/hr.
   3. 1,625 units/hr is exact, so no rounding is needed.

10. Problem 10

    Order: heparin infusion at 23.5 mL/hr for the client. Available: a bag of heparin 12,500 units in 250 mL, infusing now. How many units/hr is the client receiving? Record your answer using a whole number.

    Show answer and steps

    Answer: 1,175 units/hr

    1. Concentration = 12,500 units ÷ 250 mL = 50 units/mL.
    2. units/hr = 23.5 mL/hr × 50 units/mL = 1,175 units/hr.
    3. 1,175 units/hr is exact, so no rounding is needed.

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