HESI RN
RN Hesi Med Surg Dosage Calculations Questions
Extract:
Question 1 of 5
A child who weighs 66 pounds receives a prescription for amoxicillin 80 mg/kg/day by mouth in divided doses every 12 hours. The bottle is labeled, 'Amoxicillin for Oral Suspension, USP 400 mg per 5 mL.' How many mL should the nurse administer with each dose? (Enter numerical value only.)
Correct Answer: 15
Rationale: Weight: 66 / 2.2 = 30 kg. Daily dose: 80 mg/kg/day × 30 = 2400 mg/day. Per dose (every 12 hours): 2400 / 2 = 1200 mg. Volume: (1200 × 5) / 400 = 15 mL.
Question 2 of 5
The healthcare provider prescribes heparin 1,400 units/hour intravenously (IV). The IV bag contains heparin 20,000 units in 250 mL dextrose 5% in water. 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 whole number.)
Correct Answer: 18
Rationale: Infusion rate = (1400 units/hour × 250 mL) / 20000 units = 17.5 mL/hour, rounded to 18.
Question 3 of 5
A client who weighs 154 pounds receives a prescription for epoetin alfa 50 units/kg subcutaneously 3 times a week. The medication is available in 2000 units/ml. vial. How many mL should the nurse administer with each dose? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 1.7
Rationale: Weight: 154 × 0.4536 = 69.8544 kg. Dose: 50 units/kg × 69.8544 = 3492.72 units. Volume: 3492.72 / 2000 = 1.74636 mL, rounded to 1.7 mL.
Question 4 of 5
The nurse is caring for a client with an oral temperature of 100.6° F. What temperature in Celsius should the nurse document in the medical record? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 38.1
Rationale: C = (F - 32) × 5/9 = (100.6 - 32) × 5/9 = 38.111, rounded to 38.1°C.
Question 5 of 5
A client is receiving a 200 mL bolus of 0.9% normal saline (NS) to be infused over 20 minutes. The nurse should set the Infusion pump to deliver how many mL/hour? (Enter numeric value only.)
Correct Answer: 600
Rationale: Infusion rate = 200 mL / (20 / 60) hours = 600 mL/hour.