Which of the following formula for calculating child dose is based on body weight:
Show Hint
- Clark’s formula
- Fried’s formula
- Young’s formula
- Dilling's formula
The Correct Option is A
Approach Solution - 1
Step 1: Understanding Clark’s formula. Clark’s formula calculates the child’s dose of a medication based on the child’s body weight, ensuring accurate dosing to avoid toxicity or underdosing. The formula is: \[ \text{Child’s Dose} = \frac{\text{Weight of the child (kg)}}{70} \times \text{Adult Dose} \] or, in pounds: \[ \text{Child’s Dose} = \frac{\text{Weight of the child (lb)}}{150} \times \text{Adult Dose}. \]
Step 2: Explanation of other formulas.
- (B) Fried’s formula: Based on the child’s age in months.
- (C) Young’s formula: Based on the child’s age in years.
- (D) Dilling’s formula: Also based on the child’s age in years, specifically for older children.
Conclusion. Since Clark’s formula considers the child’s body weight for dose calculation, option (A) is correct.
Approach Solution -2
The question asks which pediatric dosing formula bases its calculation on the child's body weight rather than age. Let's check what each formula actually uses as its input.
- Clark's formula: This formula calculates a child's dose as the child's weight in kilograms (or pounds) divided by an average adult weight, multiplied by the standard adult dose. Body weight is the only variable it needs, matching the question directly.
- Fried's formula: This formula is built around the child's age measured in months, dividing age in months by 150 and multiplying by the adult dose, so its input is age, not weight.
- Young's formula: This formula uses the child's age in years, dividing age by age plus twelve and multiplying by the adult dose, again basing the calculation on age rather than weight.
- Dilling's formula: This formula also runs on the child's age in years, dividing age by twenty and multiplying by the adult dose, making it another age-based method rather than a weight-based one.
Of the four formulas, only Clark's formula plugs the child's actual body weight into the calculation, while the rest rely on age in months or years.
So the correct answer is Clark's formula.
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