According to Young's Rule, how do you calculate a child's dose?

Young's Rule provides a method for calculating the appropriate medication dose for children based on their age. The correct formula states that you take the child's age in years, divide it by the sum of their age in years plus 12, and then multiply that by the adult dose.

This formula is based on the idea that as a child grows, their ability to metabolize medications increases, and thus their dosage can be more appropriately calculated as they get older. The addition of the 12 years in the denominator helps to account for the difference in body size and metabolic rate between children and adults.

Using this formula allows healthcare providers to adjust dosages safely, as children typically require less medication than adults due to their smaller size and different physiological responses. By following Young's Rule accurately, you ensure that children receive the correct therapeutic dose, minimizing the risk of underdosing or overdosing.

The other provided choices involve incorrect formulas or components that do not align with the principles behind Young's Rule, making them unsuitable for determining a child's medication dosage based on their age.