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Exam Review

HESI RN Dosage Calculation

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Total Questions : 57

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Question 1:

A client with neuroleptic malignant syndrome receives a prescription for dantrolene 1.5 mg/kg IV. The client weighs 198 pounds. The label on 250 mg vial reads, "Reconstitute with 5 mL sterile water for injection, USP. Reconstitution yields 50 mg/mL." How many mg should the nurse administer? (Enter numeric value only.)

Answer and Explanation
Correct Answer: "135" milligrams

Explanation

Given: 1 kg = 2.2 lbs Client weighs 198 lbs

Step-by-Step Calculation:

  1. Step 1: Convert weight from pounds to kilograms: Weight in kg = (Weight in lbs) ÷ (2.2 lbs/kg) Weight in kg = 198 ÷ 2.2 Weight in kg = 90 (rounded to the nearest whole number)
  2. Step 2: Calculate the required dosage in mg: Dosage = (Weight in kg) × (Dosage in mg/kg) Dosage = 90 × 1.5 Dosage = 135

Therefore, the nurse should administer 135 mg of dantrolene.


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Question 2:

The healthcare provider prescribes filgrastim 5 mcg/kg/day subcutaneously (SubQ) 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).

Answer and Explanation
Correct Answer: "0.5" mL

Explanation

Step 1:

Convert the client's weight from pounds to kilograms. 132 pounds ÷ 2.2 = 60 kilograms

Step 2:

Calculate the total dose in mcg based on the client's weight. 5 mcg/kg × 60 kg = 300 mcg

Step 3:

Determine how many mL of medication to administer based on the available concentration. (300 mcg) ÷ (480 mcg/0.8 mL) = (300 ÷ 480) × 0.8 (300 ÷ 480) = 0.625 0.625 × 0.8 = 0.5 mL

Result: The nurse should administer 0.5 mL of the medication.


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Question 3:

The healthcare provider prescribes penicillin G benzathine 1,800,000 units intramuscular (IM) for a client with a bacterial infection. The prefilled syringe is labeled, "Penicillin G benzathine 1,200,000 units/2 mL." How many mL should the nurse administer to this client? (Enter numerical value only, rounded to the nearest whole number.)

Answer and Explanation
Correct Answer: "3" mL

Explanation

Step 1: Determine the dosage required. 1,800,000 units

Step 2: Identify the concentration available. 1,200,000 units/2 mL

Step 3: Calculate the required volume. (1,800,000 ÷ 1,200,000) × 2 = 1.5 × 2 = 3 mL


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Question 4:

The healthcare provider prescribes ampicillin 140 mg intravenously (IV) every 8 hours for a child with meningitis. The vial is labeled, "Ampicillin 250 mg for reconstitution with 83 mL sterile normal saline for injection to yield a total solution concentration of 30 mg/mL." How many mL should the nurse administer? (Enter the numeric value only. If rounding is required, round to the nearest tenth.)

Answer and Explanation
Correct Answer: "4.7" mL

Explanation

Step 1: Determine the dosage required. 140 mg

Step 2: Identify the concentration available. 30 mg/mL

Step 3: Calculate the required volume. (140 ÷ 30) = 4.6667 Rounded to the nearest tenth = 4.7 mL


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Question 5:

The healthcare provider prescribes a loading dose of digoxin 0.6 mg intravenously (IV) for a client with heart failure (HF). The nurse obtains digoxin injection 500 mcg in 2 mL vial from the electronic medication system. How many mL should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

Answer and Explanation
Correct Answer: "2.4" mL

Explanation

Step 1: Convert dosage from mg to mcg. 0.6 mg × 1000 = 600 mcg

Step 2: Identify the concentration available. 500 mcg/2 mL

Step 3: Calculate the required volume. (600 ÷ 500) × 2 = 1.2 × 2 = 2.4 mL


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Question 6:

The nurse is preparing a client's dose of an IM analgesic in a single syringe. The prescription is hydromorphone 4 mg and hydroxyzine 25 mg. The hydromorphone is available in a 10 mg/mL ampule, and the hydroxyzine is available in a 50 mg/mL vial. How many total mL should the nurse administer? (Enter the numeric value only. If rounding is required, round to the nearest tenth.)

Answer and Explanation
Correct Answer: "0.9" mL

Explanation

Step 1: Calculate the hydromorphone volume required. 4 mg ÷ 10 mg/mL = 0.4 mL

Step 2: Calculate the hydroxyzine volume required. 25 mg ÷ 50 mg/mL = 0.5 mL

Step 3: Sum the volumes. 0.4 mL + 0.5 mL = 0.9 mL


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Question 7:

Ceftazidime 750 mg IV every 12 hours is prescribed for a client with an infection. The directions on the label of the 750 mg vial instruct the nurse to reconstitute with 100 mL sterile water. The reconstituted medication provides how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

Answer and Explanation
Correct Answer: "7.5" mg/mL

Explanation

Step 1: Identify the dosage. 750 mg

Step 2: Identify the volume for reconstitution. 100 mL

Step 3: Calculate the concentration. 750 ÷ 100 = 7.5 mg/mL


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Question 8:

A client receives a prescription for oxytocin 2 milliunits/min intravenously (IV) for labor augmentation. The IV bag contains oxytocin 20 units in lactated Ringer's 1 liter. How many mL/hour should the nurse program the infusion pump to deliver? (Enter numerical value only.)

Answer and Explanation
Correct Answer: "6" mL/hour

Explanation

Step 1: Convert the concentration to milliunits. 20 units × 1000 = 20,000 milliunits

Step 2: Determine the concentration per mL. 20,000 ÷ 1000 = 20 milliunits/mL

Step 3: Calculate the infusion rate. 2 milliunits/min × 60 min/hour = 120 milliunits/hour

Step 4: Determine the volume to be administered. 120 ÷ 20 = 6 mL/hour


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Question 9:

The pharmacy delivers an IV infusion of sodium chloride 100 mL with regular insulin 50 units for a client in diabetic ketoacidosis. The prescription rate is 10 units/hour. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only.)

Answer and Explanation
Correct Answer: "20" mL/hour

Explanation

Step 1: Identify the concentration. 50 units/100 mL

Step 2: Calculate the infusion rate. 10 units ÷ 0.5 units/mL = 20 mL/hour


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Question 10:

The healthcare provider prescribes furosemide 120 mg intravenously (IV) for a client with fluid overload. Furosemide is available in a vial labeled 10 mg/mL, and the recommended rate for IV administration is 40 mg/minute. The nurse should administer the medication over what length of time in minutes? (Enter numeric value only.)

Answer and Explanation
Correct Answer: "3" minutes

Explanation

Step 1: Identify the dosage. 120 mg

Step 2: Identify the rate of administration. 40 mg/minute

Step 3: Calculate the time. 120 ÷ 40 = 3 minutes


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