The gold-standard diagnostic test for pediatric obstructive sleep apnea is what study?

• A. Overnight oximetry.
• B. CT scan of the head.
• C. Pulmonary function test.
• D. Polysomnography.

Answer: (D)

Diagnosing pediatric obstructive sleep apnea relies on capturing what happens during sleep. The best test for this is overnight polysomnography because it records multiple physiological signals at once—brain activity, eye movements, muscle tone, heart rate, respiratory effort, airflow, and oxygen saturation. With all of these together, we can calculate the apnea-hypopnea index and arousal index, distinguish obstructive from central events, and gauge how severe the sleep-disordered breathing is. This comprehensive picture is what makes polysomnography the definitive test for pediatric OSA and it also helps guide treatment decisions like whether adenotonsillectomy or sleep therapies are needed.

Other tests don’t provide the same sleep-wide view. Overnight oximetry only tracks oxygen levels and can miss events or mislead if desaturations aren’t present; CT imaging is structural and doesn’t assess sleep-related breathing; pulmonary function tests evaluate lung mechanics but not sleep-related airway obstruction.