"Clarks rule" is used for?

Appeared in: ESIC Nursing Officer 2016 (shift-1)

Explanation

Clark's rule is a method for calculating pediatric medication dosages.
It uses the child's weight in pounds (lbs) as a fraction of a standard adult weight (150 lbs) to determine the appropriate portion of an adult dose.
The formula is: Child's Dose = (Child's Weight in lbs / 150) × Adult Dose.
This method provides an estimate and is used when a specific pediatric dose from the manufacturer is unavailable.

Option A: Evaluating a child's Intelligence Quotient (IQ) is a psychological assessment, not a pharmacological calculation.
Option B: A child's mental growth (development) is assessed through developmental screening tools that evaluate milestones in areas like language, motor skills, and social interaction.
Option D: A child's physical growth is tracked using standardized growth charts that plot height, weight, and head circumference against percentile curves for their age and sex.

Visual 1: Table: Comparison of Pediatric Dosage Calculation Rules (Clark's, Young's, Fried's, BSA Method) - A table showing the name of the rule, the basis for calculation (age, weight, BSA), the formula, and its primary use case.
Visual 2: Infographic: Hierarchy of Pediatric Dosing Accuracy - A pyramid diagram showing manufacturer's recommended dose at the top (most accurate), followed by BSA method, then weight-based rules, and finally age-based rules at the bottom (least accurate).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pediatric Drug Dosage Calculation as background academic context rather than a clinical decision trigger.
Accurate medication dosage is critical in pediatrics due to physiological differences and the high risk of overdose or underdose. Clark's rule is an older estimation method.
Modern practice prioritizes manufacturer-provided pediatric doses or the Body Surface Area (BSA) method, as they are more accurate than age or weight-based rules.
Nurses must always double-check pediatric dose calculations, preferably with another qualified professional, to prevent medication errors, which can have severe consequences in children.

How to Approach the Question

Identify the key term in the question stem: 'Clarks rule'.
This is a factual recall question. Access your knowledge of pediatric pharmacology.
Recall the purpose of different named rules in medicine. Clark's, Young's, and Fried's rules are all associated with pediatric dose calculations.
Evaluate the options. Option C directly relates to drug dosage.
Eliminate the other options by associating them with their correct assessment methods: IQ tests for intelligence, developmental screening for mental growth, and growth charts for physical growth.

Concept Tested & Keywords

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