HESI RN
RN Hesi Med Surg Dosage Calculations Questions
Extract:
Question 1 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 2 of 5
A client is receiving one liter of DW 0.45% normal saline IV every 8 hours by gravity infusion. The IV tubing has a drip factor of 12 gtt/mL. The nurse should regulate the IV to deliver how many drops per minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 25
Rationale: Infusion rate: 1000 mL / 8 hours = 125 mL/hour. Flow rate: (125 × 12) / 60 = 25 gtt/min.
Question 3 of 5
The healthcare provider prescribes cefazolin 800 mg IM every six hours. The available vial is labeled, 'Cefazolin 1 gram,' and the instructions for reconstitution state, For IM use add 2.5 mL sterile water for injection to provide a total volume of 3.0 mL'. After reconstitution, the solution contains how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 333
Rationale: Concentration: 1000 mg / 3 mL = 333.333 mg/mL, rounded to 333.
Question 4 of 5
A client receives a prescription for warfarin 2 mg IM daily. The pharmacy delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read, reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many mL should the nurse administer? (Enter the numerical value only.)
Correct Answer: 1
Rationale: Volume: 2 mg / 2 mg/mL = 1 mL.
Question 5 of 5
The healthcare provider prescribes amoxicillin 500 mg every 8 hours for a child who weighs 88 pounds. The recommended maximum safe dose is 50 mg/kg/24 hour. The available suspension is labeled, Amoxicillin Suspension 250 mg/5 mL. Based on this child weight, how many mL should the nurse administer ? (Enter numerical value only. (If rounding is required, round to the whole number.))
Correct Answer: 3
Rationale: Weight: 88 × 0.454 = 39.952 kg. Max safe dose: 50 mg/kg/day × 39.952 = 1997.6 mg/day. Per dose (3 doses/day): 1997.6 / 3 = 665.87 mg. Volume: 665.87 / (250 mg / 5 mL) = 2.6635 mL, rounded to 3 mL.