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MedTestBankDosage Calculation for Nursing

Heparin drip calculation practice problems

Dosage calculation practice for nursing students: solve unlimited new problems below with instant checking, or work through the 15 problems with answers further down.

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Formula to use

Concentration (units/mL) = units in the bag ÷ mL in the bag

units/hr = units/kg/hr × weight (kg)

mL/hr = units/hr ÷ units/mL

Bolus (units) = units/kg × weight (kg)

Open the heparin drip (units/hr to ml/hr) calculator to check your own numbers step by step.

15 practice problems with answers

Solve each problem on paper first, then open the answer to compare every step.

  1. Order: heparin 12 units/kg/hr IV. The patient weighs 100 kg. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 500 = 50 units/mL.
    2. 12 units/kg/hr × 100 kg = 1,200 units/hr.
    3. 1,200 ÷ 50 = 24 mL/hr, rounded to 24 mL/hr.

    Answer: 24 mL/hr

  2. Order: heparin 15 units/kg/hr IV. The patient weighs 95 kg. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 500 = 50 units/mL.
    2. 15 units/kg/hr × 95 kg = 1,425 units/hr.
    3. 1,425 ÷ 50 = 28.5 mL/hr, rounded to 28.5 mL/hr.

    Answer: 28.5 mL/hr

  3. Order: heparin 18 units/kg/hr IV. The patient weighs 107 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 18 units/kg/hr × 107 kg = 1,926 units/hr.
    3. 1,926 ÷ 100 = 19.26 mL/hr, rounded to 19.3 mL/hr.

    Answer: 19.3 mL/hr

  4. Order: heparin infusion at 1,000 units/hr. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 units ÷ 500 mL = 50 units/mL.
    2. 1,000 units/hr ÷ 50 units/mL = 20 mL/hr, rounded to 20 mL/hr.

    Answer: 20 mL/hr

  5. Order: heparin 12 units/kg/hr IV. The patient weighs 90 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 12 units/kg/hr × 90 kg = 1,080 units/hr.
    3. 1,080 ÷ 100 = 10.8 mL/hr, rounded to 10.8 mL/hr.

    Answer: 10.8 mL/hr

  6. Order: heparin infusion at 1,500 units/hr. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 units ÷ 500 mL = 50 units/mL.
    2. 1,500 units/hr ÷ 50 units/mL = 30 mL/hr, rounded to 30 mL/hr.

    Answer: 30 mL/hr

  7. Order: heparin 15 units/kg/hr IV. The patient weighs 59 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 15 units/kg/hr × 59 kg = 885 units/hr.
    3. 885 ÷ 100 = 8.85 mL/hr, rounded to 8.9 mL/hr.

    Answer: 8.9 mL/hr

  8. Order: heparin 18 units/kg/hr IV. The patient weighs 83 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 18 units/kg/hr × 83 kg = 1,494 units/hr.
    3. 1,494 ÷ 100 = 14.94 mL/hr, rounded to 14.9 mL/hr.

    Answer: 14.9 mL/hr

  9. Order: heparin 15 units/kg/hr IV. The patient weighs 89 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 15 units/kg/hr × 89 kg = 1,335 units/hr.
    3. 1,335 ÷ 100 = 13.35 mL/hr, rounded to 13.4 mL/hr.

    Answer: 13.4 mL/hr

  10. Order: heparin 18 units/kg/hr IV. The patient weighs 83 kg. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 500 = 50 units/mL.
    2. 18 units/kg/hr × 83 kg = 1,494 units/hr.
    3. 1,494 ÷ 50 = 29.88 mL/hr, rounded to 29.9 mL/hr.

    Answer: 29.9 mL/hr

  11. Order: heparin 18 units/kg/hr IV. The patient weighs 66 kg. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 500 = 50 units/mL.
    2. 18 units/kg/hr × 66 kg = 1,188 units/hr.
    3. 1,188 ÷ 50 = 23.76 mL/hr, rounded to 23.8 mL/hr.

    Answer: 23.8 mL/hr

  12. Order: heparin 18 units/kg/hr IV. The patient weighs 106 kg. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 500 = 50 units/mL.
    2. 18 units/kg/hr × 106 kg = 1,908 units/hr.
    3. 1,908 ÷ 50 = 38.16 mL/hr, rounded to 38.2 mL/hr.

    Answer: 38.2 mL/hr

  13. Order: heparin 12 units/kg/hr IV. The patient weighs 84 kg. Available: heparin 25,000 units in 250 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 ÷ 250 = 100 units/mL.
    2. 12 units/kg/hr × 84 kg = 1,008 units/hr.
    3. 1,008 ÷ 100 = 10.08 mL/hr, rounded to 10.1 mL/hr.

    Answer: 10.1 mL/hr

  14. Order: heparin infusion at 1,200 units/hr. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 units ÷ 500 mL = 50 units/mL.
    2. 1,200 units/hr ÷ 50 units/mL = 24 mL/hr, rounded to 24 mL/hr.

    Answer: 24 mL/hr

  15. Order: heparin infusion at 1,100 units/hr. Available: heparin 25,000 units in 500 mL. At what rate in mL/hr will you set the pump?

    Show the answer
    1. Concentration: 25,000 units ÷ 500 mL = 50 units/mL.
    2. 1,100 units/hr ÷ 50 units/mL = 22 mL/hr, rounded to 22 mL/hr.

    Answer: 22 mL/hr