What Is AHI? The Sleep Apnea Severity Score Guide
The apnea-hypopnea index counts how many times per hour of sleep your breathing stops or nearly stops. It is the single number that defines the diagnosis, grades severity on a standard scale, and later tracks whether treatment is doing its job.
Key takeaways
- An apnea is a complete airflow stop of ten seconds or more; a hypopnea is a partial reduction with an oxygen drop or arousal attached.
- AHI bands: under 5 is normal, 5–14 mild, 15–29 moderate, and 30 or more severe obstructive sleep apnea.
- Severe disease means breathing is disrupted at least every two minutes all night — some patients exceed 60 events per hour.
- AHI varies night to night and by position, so a single borderline result may be repeated, especially if the test night was atypical.
- After treatment starts, the goal is an AHI under 5 on therapy; residual events above that trigger mask, pressure, or device adjustments.
What This Guide Covers
The apnea-hypopnea index counts how many times per hour of sleep your breathing stops or nearly stops. It is the single number that defines the diagnosis, grades severity on a standard scale, and later tracks whether treatment is doing its job. This guide walks you through what matters most, why it happens, and the practical steps with the best support behind them.
First, the foundation: an apnea is a complete airflow stop of ten seconds or more; a hypopnea is a partial reduction with an oxygen drop or arousal attached.
Next, the details: aHI bands: under 5 is normal, 5–14 mild, 15–29 moderate, and 30 or more severe obstructive sleep apnea.
Then, the practical side: severe disease means breathing is disrupted at least every two minutes all night — some patients exceed 60 events per hour.
Another angle worth knowing: aHI varies night to night and by position, so a single borderline result may be repeated, especially if the test night was atypical.
Finally, the big picture: after treatment starts, the goal is an AHI under 5 on therapy; residual events above that trigger mask, pressure, or device adjustments.
Frequently Asked Questions
What is ahi?
The apnea-hypopnea index counts how many times per hour of sleep your breathing stops or nearly stops. It is the single number that defines the diagnosis, grades severity on a standard scale, and later tracks whether treatment is doing its job.
How long until I see improvement?
Most of the strategies in this guide start showing effect within one to two weeks of consistent practice. Supplement- and device-based approaches vary more, so track your nights in a simple sleep diary and judge by weekly trends rather than single nights.
When should I see a doctor?
If the problem lasts more than a few weeks, disrupts your daytime functioning, or comes with warning signs such as breathing pauses, gasping during sleep, chest discomfort, or severe daytime sleepiness, it is time to consult a qualified healthcare professional rather than self-treating.