Dosage Calculation RN Adult Medical Surgical Proctored Assessment 3.2

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Sample questions from Dosage Calculation RN Adult Medical Surgical Proctored Assessment 3.2

This material has 90 questions with answers and rationales. Here are the first 5.

1. 1.The provider prescribes furosemide 40 mg IV for a client with acute heart failure. The vial is labeled 10 mg/mL. How many milliliters should the nurse administer?

   • A.2 mL
   • B.4 mL
   • C.10 mL
   • D.40 mL

   Rationale: Divide the prescribed dose, 40 mg, by the concentration, 10 mg/mL, to obtain 4 mL. Giving 2 mL would provide only 20 mg, while 10 mL and 40 mL would provide excessive doses. For injectable medications, calculate the volume from the concentration on the supplied product.

2. 2.A client with atrial fibrillation is prescribed warfarin 7.5 mg by mouth. The available tablets contain 5 mg each. How many tablets should the nurse administer?

   • A.2 tablets
   • B.1 tablet
   • C.0.5 tablet
   • D.1.5 tablets

   Rationale: Divide the prescribed dose of 7.5 mg by 5 mg per tablet to obtain 1.5 tablets. One tablet provides only 5 mg, and 2 tablets provide 10 mg. A half tablet provides only 2.5 mg, so it is not the prescribed dose.

3. 3.In the cardiac intensive care unit, a client weighing 70 kg is prescribed dopamine at 5 mcg/kg/min. The solution contains 400 mg of dopamine in 250 mL of fluid. At what rate should the nurse set the infusion pump in mL/hr?

   • A.52.5 mL/hr
   • B.5.25 mL/hr
   • C.13.1 mL/hr
   • D.21.9 mL/hr

   Rationale: The required dose is 5 mcg/kg/min x 70 kg = 350 mcg/min, or 21,000 mcg/hr. The concentration is 1,600 mcg/mL, so 21,000 divided by 1,600 equals 13.125 mL/hr, rounded to 13.1 mL/hr. The other rates result from errors such as not converting minutes to hours or miscalculating the solution concentration.

4. 4.A client weighing 82 kg is prescribed a heparin infusion at 18 units/kg/hr. The IV bag contains 25,000 units of heparin in 500 mL. Which statements correctly describe the calculated infusion rate or the calculation? Select all that apply.

   • A.The pump should be set to 59.0 mL/hr.
   • B.The pump should be set to 14.8 mL/hr.
   • C.The prescribed dose is 1,476 units/hr.
   • D.The solution concentration is 50 units/mL.
   • E.The pump should be set to 29.5 mL/hr.

   Answer and rationale are in the full material.

5. 5.A client with heart failure is prescribed digoxin 0.125 mg by mouth. The oral solution is labeled 0.05 mg/mL. How many milliliters should the nurse administer?

   • A.2.5 mL
   • B.0.4 mL
   • C.1.25 mL
   • D.6.25 mL

   Answer and rationale are in the full material.