A nurse is preparing to administer ondansetron 0.15 mg/kg IV bolus to a school-age child who weighs 78 lb. Available is ondansetron solution for injection 2 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["2.7"]
Step 1: Convert the child's weight from pounds to kilograms.
We know that 1 kg = 2.2 lb,
Weight in kg=Weight in lb=78/2.2≈35.45 kg
Step 2: Calculate the required dose of ondansetron in mg.
The prescribed dose is 0.15 mg per kg:
Dose in mg=0.15 mg/kg×35.45 kg=5.318 mg
Step 3: Determine the volume of ondansetron to administer.
To determine how many mL the nurse should administer, we use the following formula:
Volume (mL)=Dose in mg/Concentration in mg/mL=5.318 mg/2 mg/mL=2.659 mL
Step 4: Round the answer:
Rounding 2.659 mL gives 2.7 mL.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Answer: A. Budesonide 0.25 mg inhalation 2 times daily
Rationale:
A. Budesonide 0.25 mg inhalation 2 times daily:
While budesonide 0.25 mg is commonly prescribed for young children, a toddler weighing 30 kg exceeds the typical weight range for which this low dose is intended. Higher doses may be needed, and the dose should be clarified in relation to the child's size and clinical condition. The provider should confirm whether this is the appropriate dose.
B. Amoxicillin 250 mg PO q8h:
This is a commonly accepted pediatric dose for a toddler and generally falls within the safe dosage range for a child of 30 kg, especially when treating common infections. It does not require clarification.
C. Montelukast 4 mg PO daily:
Montelukast 4 mg is the standard daily dose for children aged 2–5 years. For a toddler (under 6), even if the weight is high, this dose is consistent with guidelines and doesn't require clarification.
D. Albuterol 2.5 mg inhalation q8h:
Albuterol 2.5 mg per nebulizer treatment is a standard dose for children, including toddlers, and can be safely administered every 6 to 8 hours. No clarification is needed for this order.
Correct Answer is ["3.5"]
Explanation
Convert the child’s weight from pounds to kilograms:
52 lb÷2.2=23.6 kg.
Calculate the total daily dose in micrograms (mcg):
7.5 mcg/kg/day×23.6 kg=177 mcg/day.
Determine the volume in mL to administer:
The elixir concentration is 50 mcg/mL
177 mcg÷50 mcg/mL=3.54 mL.
Round to the nearest tenth:
3.54 rounds to 3.5 mL.
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