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Nursing QUESTION #9260
Question 1
A nurse is calculating drug dosage for a child using Young's formula. The adult dose of a drug is 300 mg. The child is 6 years old. What is the correct pediatric dose?
  • 100 mg✔️
  • 120 mg
  • 150 mg
  • 200 mg
Correct Answer Explanation

Young's Formula for pediatric dosage calculation:

\[\text{Child's dose} = \frac{\text{Age (years)}}{\text{Age (years)} + 12} \times \text{Adult dose}\]

Calculation:

\[\text{Child's dose} = \frac{6}{6 + 12} \times 300\,\text{mg}\]

\[= \frac{6}{18} \times 300\,\text{mg}\]

\[= \frac{1}{3} \times 300\,\text{mg} = 100\,\text{mg}\]

Other pediatric dose formulas:

FormulaMethod
Young's\(\dfrac{\text{Age}}{\text{Age}+12} \times \text{Adult dose}\) (for children)
Dilling's\(\dfrac{\text{Age}}{20} \times \text{Adult dose}\)
Clark's (weight)\(\dfrac{\text{Weight (kg)}}{70} \times \text{Adult dose}\)
Fried's (infants)\(\dfrac{\text{Age (months)}}{150} \times \text{Adult dose}\)
BSA method\(\dfrac{\text{Child's BSA (m}^2\text{)}}{1.73} \times \text{Adult dose}\) — most accurate

BSA-based dosing is most precise in clinical practice. Young's formula is used when weight is unavailable.