Diagnosis

How is Sleep Apnea Diagnosed?

Obstructive sleep apnea is diagnosed by a physician using a polysomnogram (PSG), also called a sleep study. During a PSG, the patient will spend a night at a sleep laboratory while connected to monitoring equipment. The PSG study produces a number called the AHI (apnea hypopnea index) that is one of the variables physicians use in determining the level of severity of sleep apnea.

Level of OSA Severity	AHI
Normal	≤5
Mild	5-15
Moderate	15-30
Severe	≥30