Sleep Numbers & What They Mean
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
30/hr = severe. OSA