The Apnea–Hypopnea Index or Apnoea–Hypopnoea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and be associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep disruptions and the degree of oxygen desaturation (low oxygen level in the blood).
- Normal: AHI<5
- Mild sleep apnea: 5≤AHI<15
- Moderate sleep apnea: 15≤AHI<30
- Severe sleep apnea: AHI≥30
For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.
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- "Obstructive Sleep Apnea in Children". aafp.org. American Academy of Family Physicians. Retrieved 11 October 2016.