HESI RN
RN Hesi Med Surg Dosage Calculations Questions
Extract:
Question 1 of 5
The healthcare provider prescribes streptomycin 200 mg intramuscularly every 12 hours. The vial is labeled, 'Streptomycin 1 gram/2.5 mL. How many milliliters should the nurse administer? (Enter numerical value only. (If rounding is required, round to the nearest tenth.))
Correct Answer: 0.5
Rationale: Concentration: 1 g = 1000 mg / 2.5 mL. Proportion: 1000 mg / 2.5 mL = 200 mg / x mL. Solving, x = (200 × 2.5) / 1000 = 0.5 mL.
Question 2 of 5
A client who weighs 91 kg receives a prescription for a continuous infusion of dopamine at 3 mcg/kg/min. The solution is labeled, 'Dopamine 400 mg in 5% Dextrose Injection 250 mL.' How many mL/hr should the nurse program the infusion pump to deliver? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 10.2
Rationale: Calculate dose: 3 mcg/kg/min × 91 kg = 273 mcg/min. Convert to hourly: 273 × 60 = 16380 mcg/hour. Concentration: 400 mg = 400000 mcg in 250 mL = 1600 mcg/mL. Infusion rate = 16380 / 1600 = 10.2375 mL/hour, rounded to 10.2.
Question 3 of 5
The healthcare provider prescribed 2 liters of 5% Dextrose in water (DW) to infuse in 24 hours. The IV administration set delivers 15 gtt/mL. How many ml/hour should the nurse program the infusion pump? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 83
Rationale: Infusion rate = 2000 mL / 24 hours = 83.333 mL/hour, rounded to 83.
Question 4 of 5
The healthcare provider prescribes filgrastim 5 mog/kg/day subcutaneously for a client who weighs 132 pounds and has just completed chemotherapy. The medication is available in 480 mcg/0.8 mL. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 0.5
Rationale: Weight: 132 / 2.2 = 60 kg. Dose: 5 mcg/kg/day × 60 = 300 mcg/day. Concentration: 480 mcg / 0.8 mL = 600 mcg/mL. Volume: 300 / 600 = 0.5 mL. [Note: Document states 500.0 mL, likely a typo; correct calculation yields 0.5 mL.]
Question 5 of 5
The healthcare provider prescribes lamivudine oral solution 150 mg twice daily for a client who is HIV positive. The available bottle contains 240 mL of lamivudine labeled, '10 mg/mL.' How many mL should the nurse administer in a 24 hour period? (Enter numeric value only.)
Correct Answer: 30
Rationale: Dose per administration: 150 mg / (10 mg/mL) = 15 mL. Daily volume: 15 × 2 = 30 mL.