Work out apnoea hypopnoea index instantly with clear inputs, formula shown and shareable results.
Divides the total number of apnoeas and hypopnoeas by hours of sleep to give the apnoea-hypopnoea index used to grade sleep apnoea severity.
AHI
AHI = (apnoeas + hypopnoeas) / total sleep time in hours; mild 5-14.9, moderate 15-29.9, severe 30 or more
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
No. The respiratory disturbance index also counts respiratory effort related arousals, so it is usually higher.
Home studies use recording time rather than measured sleep time, which tends to underestimate the index.