Apnea hypopnea index (AHI)

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AHI Rating
<5 Normal (no Sleep Apnea)
5-15 Mild Sleep Apnea
15-30 Moderate Sleep Apnea
>30 Severe Sleep Apnea

The Apnea-Hypopnea Index (AHI) is used as a measure of the severity of the condition known as sleep apnea. The AHI is the sum of the number of apneas (pauses in breathing) plus the number of hypopneas (periods of shallow breathing) that occur, on average, each hour. To count in the index apneas and hypopneas, collectively called events, must have a duration of at least 10 seconds.

The AHI, as with the separate Apnea Index and Hypopnea Index, is calculated by dividing the number of events by the number of hours of sleep.