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What is Sleep Apnea?
Obstructive Sleep Apnea (OSA)
Central Sleep Apnea (CSA)
Sleep Labs
Home Sleep Study
What is Tested?
Apnea–Hypopnea Index (AHI)
How to use the Ares
How to use WatchPat
Intializing the ARES
Uploading the Results
What's Next?

Sleep Numbers & What They Mean

The apnea–hypopnea index or apnoea–hypopnoea index (AHI) is an index of sleep apnea severity that combines apneas and hypopneas. The apneas (pauses in breathing) must last for at least 10 seconds and are associated with a decrease in blood oxygenation. Combining these values gives an overall sleep apnea severity score that evaluates both number of sleep disruptions and degree of oxygen desaturation (low blood oxygen levels).

The AHI is used to manage your appropriate treatment and determine your severity of Obstructive Sleep Apnea or OSA

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.

AHI values are typically categorized as events per hour:

 5–15/hr = mild  OSA       15–30/hr = moderate   OSA          above  30/hr = severe. OSA