Reaching Your AHI CPAP Goals (Includes Tips from a CRT!)

April 21, 2026 |

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Key Takeaways

The apnea-hypopnea index (AHI) is a measure of sleep apnea severity.
AHI is the number of complete and partial interruptions in breathing that occur per hour during sleep.
Both lifestyle changes and CPAP adjustment can help lower AHI.

Obstructive sleep apnea can vary in severity. Measuring the severity of your sleep apnea can help you decide on the best treatment approach. Additionally, obtaining a baseline measure of sleep apnea severity can help determine the effectiveness of treatment.

What is the Apnea-Hypopnea Index?

Sleep apnea causes brief interruptions in breathing. Pauses in breathing may be complete or partial and are known as the following:

Apnea: Apnea is a complete pause in breathing lasting 10 seconds or more.
Hypopnea: Hypopnea is a partial reduction in airflow, usually 30 percent or more, that lasts at least 10 seconds.

Both types of breathing interruptions are associated with a brief awakening, a drop in oxygen levels, and increased cardiovascular strain. The more interruptions in breathing during sleep, the more severe the sleep apnea.

The apnea-hypopnea index is the main metric used to determine the severity of obstructive sleep apnea. It indicates how many times per hour a person stops breathing or partially stops breathing during sleep.

How is the Apnea-Hypopnea Index Calculated?

The apnea-hypopnea index (AHI) is measured using the following calculation:

Number of Apneas + Number of Hypopneas ÷ Hours of Sleep

For example, if someone has 50 apnea events and 50 hypopnea events over five hours, the calculation is:

50 + 50 = 100
100 ÷ 5 = AHI of 20

This means a person has 20 breathing interruptions per hour. The AHI helps doctors classify the severity of sleep apnea. The severity categories include:

AHI	Sleep Apnea Severity
< 5	Normal
5 - 14.9	Mild
15 - 29.5	Moderate
30 or higher	Severe

A higher AHI may indicate greater overnight drops in oxygen levels and increased stress on your cardiovascular system. This places you at an increased risk for atrial fibrillation, high blood pressure, and insulin resistance.

What is a Good AHI Score on a CPAP Machine?

CPAP therapy is intended to reduce the number of breathing interruptions or pauses overnight. A good AHI on CPAP is generally 5 or less.
To break it down further:

A score of 1-2 is excellent.
A score of 5 indicates well-controlled apnea and means treatment is working.
A score above 5 may require an adjustment in treatment.

How to Reach Your AHI CPAP Goals (Tips from a Certified Respiratory Therapist!)

As a respiratory therapist, I have seen people dramatically decrease their AHI after starting CPAP therapy. It may take a little trial and error to lower AHI, but it can be done. Usually, a combination of lifestyle changes and CPAP adjustments works best. Here is what you can do.

Lifestyle Changes

Lifestyle changes do not replace CPAP therapy. However, they may reduce the severity of your sleep apnea by lowering the pressure requirements and the frequency of apneic episodes.
Lifestyle changes may include:

Maintain a Healthy Weight: Excess weight around the abdomen and neck can increase the risk of airway collapse. Fat deposits around the neck narrow the upper airway. Increased abdominal pressure from excess weight can reduce lung expansion. Getting to a healthy weight can help reduce the severity of sleep apnea and lower the AHI.
Exercise Regularly: Regular exercise can decrease systemic inflammation, improve airway muscle tone, and decrease fluid retention. All of these factors may improve sleep apnea symptoms and reduce AHI.
Change Sleeping Position: Most people have increased apneic episodes when sleeping on their back. When you sleep on your back, your tongue and soft tissues can fall back into your throat, increasing airway obstruction. Consider switching to side sleeping to reduce gravitational airway collapse. Learn more about sleep positions for sleep apnea here.
Quit Smoking: Smoking can increase upper airway inflammation and mucus production. This may narrow the airway and increase the risk of airway collapse. Quitting smoking may reduce AHI over time.

Make CPAP Therapy Adjustments

Making CPAP adjustments may also help reduce AHI and include:

Check for Mask Leaks: Mask leaks reduce the pressure delivered to your airways and may not keep them open. Check for leaks by listening and feeling for air coming out around the CPAP mask. Also, check the leak data on your CPAP machine or its associated app.
Talk to Your Doctor: CPAP therapy may need to be adjusted periodically. If you continue to have an AHI greater than 5, you may need to have increased pressure settings, modify the ramp feature, or adjust expiratory pressure relief.

Where to Find the Best CPAP Products

If your AHI is higher than it should be, you may just need to make a few adjustments, such as finding the right mask. At The CPAP Shop, there is a wide variety of CPAP masks, tubing, and supplies to optimize treatment and comfort.

Visit The CPAP Shop for all your CPAP needs. For assistance, give our customer care team a call at 866-414-9700.

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MaryAnn DePietro, CRT

MaryAnn DePietro B.S. CRT is a licensed respiratory therapist working at a trauma center in Northern California. She received a B.S. degrees in Rehabilitation from Penn State University and in respiratory therapy from American River College in Sacramento.