Final answer:
To confirm peripheral edema, one should perform palpation for pitting edema, which is the correct assessment method among the options presented.
Step-by-step explanation:
The student has asked about how to confirm the presence of peripheral edema in a school-age child. The correct way to assess is through palpation for pitting edema, which means pressing a finger into the swollen area and checking if a dent remains for several seconds after removing the finger. Blood glucose levels, blood pressure measurement, and respiratory rate assessment are not direct methods for confirming peripheral edema.