Apnea-hypopnea index

Last revised by Yaïr Glick on 2 Aug 2023

The apnea-hypopnea index (AHI) is a clinical tool to assess severity of obstructive sleep apnea. It is taken as the combined average number of apneoas and hypopnoeas occurring per hour of sleep.

According to the American Academy of Sleep Medicine (AASM) it is categorized into

  • mild (5-15 events/hour)

  • moderate (15-30 events/hour)

  • severe (>30 events/hour)

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