Apnea/hypopnea index (AHI)

 

Number of events per hour, calculated as:

 

Apneas (no airflow for 10 seconds or longer)
+
Hypopneas (shallow breathing where airflow reduced by at least 50% - lasting 10 seconds or longer)

 

A diagnosis of Obstructive Sleep Apnea is based on:

  • AHI 5-15 - Mild Sleep Apnea
  • AHI 15-30 - Moderate Sleep Apnea
  • AHI >30 - Severe Sleep Apnea

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