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