A sleep study report can feel like a wall of numbers and abbreviations, and the one most people zero in on first is the AHI score. It’s the figure that carries the most weight in determining whether obstructive sleep apnoea is present and how significant it might be.
What the AHI Score Actually Measures
AHI stands for apnoea-hypopnoea index. It’s a count of how many times your breathing either stops completely (an apnoea) or becomes significantly shallower (a hypopnoea) during each hour of sleep. The score itself is an average across the whole night, calculated from the total number of these events divided by your total sleep time.
Broadly, the higher the number, the more frequently your breathing was disrupted overnight. A low score suggests fewer interruptions, while a higher score points to more frequent ones. Sleep specialists use this figure alongside other measurements from the study, such as oxygen levels, to build a fuller picture of what’s happening while you sleep.
How a Sleep Study Arrives at This Number
Healthdirect explains that during a sleep study, your breathing and oxygen levels are monitored while you sleep, either in a supervised sleep laboratory or through a home-based test. Sensors track things like airflow, chest movement and blood oxygen throughout the night, and this data is what’s used afterward to calculate your AHI.
Because the AHI is an average over several hours, a single bad stretch of sleep won’t necessarily produce a high score on its own, and a generally good night’s sleep with a few disrupted periods might still average out lower than expected. This is part of why the number is best interpreted by a sleep specialist alongside the rest of your report, rather than read in isolation.
Making Sense of Where Your Score Sits
Sleep specialists generally group AHI results into broad categories, from within the normal range through to more significant levels of disruption. Where your particular score falls affects the kinds of treatment options that might be discussed with you, though your specialist will interpret this in the context of your symptoms, health history and the rest of your sleep study results rather than the number alone.
A few things worth keeping in mind when looking at your own report:
- The AHI is one part of the report, not the whole picture
- Oxygen desaturation levels and symptom patterns are also taken into account
- The same AHI score can mean different things for different people depending on other health factors
- Your GP or sleep specialist is the right person to walk you through what your specific result means
What Happens After You Receive Your Results
Once your AHI score and the rest of your sleep study report are available, your GP or sleep specialist will use them to discuss whether treatment is worth considering and what form that might take. Healthdirect notes that treatment for obstructive sleep apnoea can range from self-care measures like weight management, through to continuous positive airway pressure (CPAP) or an oral appliance fitted by a dentist, with surgery considered in some cases if other options haven’t helped.
If an oral appliance is raised as an option, that’s where a dentist trained in this area becomes part of the conversation. The sleep disorder centre at Wahroonga Dental Group works alongside your GP or sleep specialist to assess whether a custom-fitted device may be a suitable option, based on your sleep study results and a dental examination.
Where a Dentist Fits Into the Picture
Not every treatment path for sleep apnoea sits solely with a doctor. For some patients, particularly those with mild to moderate results, a dentist-fitted oral appliance is one of the options discussed. This is different to a standard night guard, and if you’re trying to work out which type of device might apply to your situation, it’s worth reading about the distinction between snoring and sleep apnoea before your next appointment, since the two conditions overlap but aren’t the same thing.
Why Snoring and a High AHI Score Aren’t Always the Same
Loud snoring is a common symptom of obstructive sleep apnoea, but not everyone who snores has a high AHI score, and not everyone with sleep apnoea snores loudly. This distinction matters because it affects what kind of assessment is worth pursuing. The connection between snoring, sleep apnoea and oral health is worth understanding in more depth if you’re trying to figure out whether your own symptoms warrant a referral for a sleep study in the first place.
Questions Worth Asking Your Specialist
When your sleep study results come back, a few questions can help you get more out of the conversation with your GP or specialist:
- What category does my AHI score fall into, and what does that mean for me specifically?
- Are there other results in my report, like oxygen levels, that are also significant?
- What treatment options are considered suitable given my overall results?
- Would an oral appliance be worth discussing, or is CPAP the more appropriate starting point?
- How often will my treatment need to be reviewed or adjusted?
Frequently Asked Questions
Does a Higher AHI Score Always Mean Worse Symptoms?
Not necessarily. Some people with a relatively high AHI score report feeling less affected day to day, while others with a lower score notice more disruption to their daily energy and concentration. Symptoms and results don’t always track perfectly together, so both are considered when discussing treatment. Individual experiences vary.
Can My AHI Score Change Between Sleep Studies?
Yes, results can vary from night to night and study to study, since sleep quality, position, alcohol intake and even the type of test used can all influence the outcome. If your specialist recommends a repeat study, this is often to get a clearer or more current picture. Results vary between individuals and even between nights for the same person.
Is a Home Sleep Study as Accurate as a Lab-Based One?
Both types of study are used in Australia, and your GP or specialist can advise which is more suitable for your situation. Each has strengths depending on what’s being assessed. This is a decision best made with your treating practitioner based on your individual circumstances.
Will My Dentist See My Full Sleep Study Report?
If an oral appliance is being considered as part of your treatment, your dentist will generally want to see your sleep study results to help determine whether this option is suitable for you. This is usually coordinated with your GP or sleep specialist as part of the referral process.
Does Treating Sleep Apnoea Improve the AHI Score Itself?
Effective treatment, whether that’s CPAP, an oral appliance or other measures, generally aims to reduce the frequency of breathing interruptions during sleep. Whether this changes your AHI score on a follow-up study depends on your specific treatment and how well it’s working for you. Individual results vary and are best reviewed with your treating practitioner.
Discuss an Oral Appliance Option in Wahroonga
If your sleep study results have raised the possibility of an oral appliance, the sleep disorder centre at Wahroonga Dental Group can assess whether this may be a suitable option alongside your GP or specialist’s recommendations. We see patients from Wahroonga and surrounding suburbs including Waitara, Hornsby, Normanhurst, Warrawee and Asquith. You can book an appointment online to discuss your results and next steps.