What level of apnea-hypoapnea index (AHI) qualifies as moderate to severe sleep apnea?

The apnea-hypoapnea index (AHI) is a crucial measurement used to diagnose and classify the severity of sleep apnea based on the number of apneas and hypopneas that occur per hour of sleep. According to established guidelines, the classification of sleep apnea severity is as follows:

• AHI less than 5 indicates normal or no sleep apnea.

• AHI between 5 and 15 indicates mild sleep apnea.

• AHI between 15 and 30 is categorized as moderate sleep apnea.

• AHI greater than 30 denotes severe sleep apnea.

Since the question pertains to what level of AHI qualifies as moderate to severe sleep apnea, a level of 15 is the threshold for moderate sleep apnea, while levels 30 and above indicate severe sleep apnea. This makes 15 a pivotal value, as it marks the transition point from mild to moderate apnea.

Therefore, the correct answer is 15, as it distinguishes the onset of moderate sleep apnea, an important consideration in determining the appropriate treatment and management for individuals experiencing this condition.