What is a reason younger children may need specific testing?

Younger children often require specific testing because their bodies process medications and other treatments differently than adults due to their smaller size and developing physiological systems. This variability means that smaller children may require different dosage amounts to achieve the desired therapeutic effect safely. Dosing that is appropriate for adults could be ineffective or harmful if given to children without proper adjustments. Specific testing helps determine the exact dosage needed for children based on their age, weight, and overall health. This ensures that they receive the most effective and safe treatment tailored to their unique needs.

In contrast, the other options do not accurately represent the reasons for specific testing. While immune response may vary among age groups, it is not the primary reason for tailored dosing. Additionally, younger children are often more susceptible to side effects rather than less prone, and the timing for testing isn't solely dictated by age in the same way the necessity for dosage adjustments is. Thus, the focus on appropriate dosing is key to understanding why children may need specific testing.