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 B
Explanation
A) Budesonide 0.25 mg inhalation 2 times daily:
Budesonide is a corticosteroid often used in the management of asthma or other respiratory conditions in children. The prescribed dosage of 0.25 mg inhalation twice daily is within typical pediatric dosages for this medication and would be appropriate for a toddler. This dose is not unusual and would not require further clarification, assuming the prescribed dosage form is correct.
B) Amoxicillin 250 mg PO q8h:
Amoxicillin dosing is typically based on the child’s weight. For a toddler weighing 30 kg, a standard dose of amoxicillin would generally range from 25 to 45 mg/kg/day in divided doses. A total daily dose of 750 mg (250 mg three times a day) exceeds typical weight-based recommendations for a child of this size, which generally would be closer to 600 mg or less. This suggests that the prescribed dose may be too high for a toddler weighing 30 kg, requiring clarification from the prescribing healthcare provider.
C) Montelukast 4 mg PO daily:
Montelukast is commonly prescribed for pediatric asthma or allergic rhinitis. The 4 mg daily dose is consistent with recommendations for children ages 2 to 5 years old, which makes this prescription appropriate. There is no indication that this dose is outside the recommended range, so no clarification is necessary for this prescription.
D) Albuterol 2.5 mg inhalation q8h:
Albuterol is commonly used as a bronchodilator for children with asthma or other respiratory issues. The prescribed dose of 2.5 mg per inhalation, given every 8 hours, is within the standard dosage for pediatric patients. This dosing is typical for children older than 2 years and would not require further clarification. The prescription is safe and appropriate for a toddler of this weight.
Correct Answer is ["0.24"]
Explanation
Step 1: Convert the infant's weight from pounds to kilograms.
To convert pounds to kilograms, we use the conversion factor 1 kg = 2.2 lb.
Weight in kg= 21/2.2≈9.55 kg
Step 2: Calculate the total daily dose of clindamycin in mg.
Total dose in mg/day=15 mg/kg/day×9.55 kg=143.25 mg/day
Step 3: Divide the total daily dose into 4 equal doses (every 6 hours).
We divide the total daily dose by 4:
Dose per administration=143.25 mg/4=35.8125 mg/dose
Step 4: Determine the volume to administer per dose.
The available clindamycin phosphate injection concentration is 150 mg/mL. To determine how many mL the nurse should administer per dose, we use the following formula:
Volume (mL)=Dose in mg/Concentration in mg/mL=35.8125 mg/150 mg/mL=0.238 mL
Step 5: Round the answer.
Rounding off 0.238 mL gives 0.24 mL.
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