How is a child's dose determined using Clark's Rule?

Clark's Rule is a calculation used to determine a child's medication dosage based on their weight relative to an adult dosage. The formula states that the child's dose is calculated by taking the child's weight in pounds, dividing it by 150, and then multiplying that result by the adult dose. This calculation allows for a scaling of the adult dosage to make it appropriate and safe for a child's smaller body size.

Using this approach takes into account the idea that the average adult weight is considered to be 150 pounds, serving as a baseline for adjustments. As children's weights can vary significantly and are generally much lower than that of an adult, this method helps to accurately estimate a safe and effective dose.

This rule provides an essential framework for ensuring that children receive the correct amount of medication without the risks associated with using an adult dose directly. The other options do not align with Clark's Rule methodology, either by referencing inappropriate factors like height or using incorrect units of measurement that could lead to unsafe dosing.