AHI or Apnea Hypopnea Index is a system used to measure the severity level of Sleep Apnea on a scale from normal to severe. It counts the number of Hypopnea events that occur per hour.
- Normal – less than 5 events per hour
- Mild – 5-15 events per hour
- Moderate – 16-30 events per hour
- Severe – over 30 events per hour