A sleep apnea diagnosis starts with a sleep study, a test that records what your body does while you sleep. If your doctor suspects you have sleep apnea, they will refer you to a sleep specialist who will order one of two types of sleep tests.
The process is straightforward. However, many people feel anxious because they do not know what to expect. This guide explains exactly how sleep apnea is diagnosed, what happens during a sleep study, and what comes next.
What Is a Sleep Apnea Diagnosis and Who Makes It?
A sleep apnea diagnosis is made by a sleep specialist, a doctor trained to identify and treat sleep disorders. Your family doctor will usually be the first to notice warning signs.
For example, they may ask about loud snoring, gasping during sleep, or daytime fatigue. If those signs are present, they will refer you for a formal sleep disorder test.
The specialist reviews your symptoms and medical history first. They may also use a screening tool, such as the Epworth Sleepiness Scale, to measure how tired you feel during the day. Based on this, they will determine which type of sleep test is right for you.
You can learn what sleep apnea is and how it affects your body on the InspiAIR website.
It is important to understand that a sleep study is not optional. It is the only way to confirm a diagnosis. Without it, a doctor cannot prescribe CPAP therapy or any other treatment. Therefore, getting the test done is the first and most important step.
Two Types of Sleep Studies: In-Lab vs. Home Sleep Test
There are two main types of sleep disorder tests. Each works differently, and your sleep specialist will choose the one that fits your situation.
In-Lab Polysomnography (PSG)
A polysomnography is an overnight test done at a sleep clinic. You arrive in the evening and sleep in a private room while sensors monitor your brain waves, oxygen levels, heart rate, breathing, and body movements.
A registered polysomnographic technologist watches the data in real time throughout the night. This is the most detailed sleep study available, and it can diagnose a wide range of sleep disorders.
The room is quiet and darkened, much like a hotel room. You are not confined or restricted. Most people fall asleep within a reasonable time, even with the sensors attached. The entire process takes 8 to 10 hours.
Home Sleep Apnea Test (HSAT)
A home sleep test is a simpler option for people with a high likelihood of obstructive sleep apnea. Your sleep apnea doctor provides a small device that you take home.
You attach the sensors yourself before bed, typically on your finger, chest, and nose, and sleep as normal. The device records your breathing and oxygen data overnight. You return it the next day so the specialist can analyze the results.
In contrast to an in-lab test, a home test measures fewer data points. As a result, it may miss less common sleep disorders. However, it is convenient and works well for straightforward cases looking for a confirmation of OSA prior to the level 1 sleep study.
In-Lab Sleep Study vs. Home Sleep Test: A Quick Comparison
| Feature | In-Lab Sleep Study (PSG) | Home Sleep Test (HSAT) |
|---|---|---|
| Location | Sleep clinic | Your own home |
| Supervision | Yes, RPSGT monitors in real time | No, self-administered |
| Data collected | Comprehensive (brain waves, limb movement, heart rate, breathing, oxygen) | Limited (breathing, oxygen, heart rate) |
| Best for | Complex or unclear cases, suspected conditions beyond OSA | Straightforward suspected obstructive sleep apnea |
| Duration | 8 to 10 hours overnight | One night at home |
| Results reviewed by | Sleep physician | Sleep physician |
| Ontario ADP funding eligibility | Yes (if diagnosis confirmed) | No |
How to Prepare for Your Sleep Study
Preparing well helps your test reflect a normal night. On the day of your sleep study, wake up at your regular time. Eat your meals as usual and take your regular medications.
Additionally, avoid caffeine after noon and skip any afternoon naps. Both can interfere with how quickly you fall asleep during the test.
If you are doing an in-lab study, wash your hair and avoid styling products. Sensors need to stick to your scalp, and gels or sprays make that harder.
For a home test, read the instructions carefully before your test night. Your sleep apnea doctor or clinic will provide written guidance in advance.
You are welcome to bring comfortable pyjamas, your usual pillow, and any personal items that help you sleep. The goal is to make the experience as close to a normal night as possible.
For more detailed preparation tips, visit the InspiAIR page on sleep studies and funding in Ontario.
What Happens After the Sleep Study: Results and Next Steps
After your test, the data goes to a sleep physician for review. This process typically takes several weeks, depending on the clinic.
The physician looks for a measure called the Apnea-Hypopnea Index (AHI), which is the number of breathing disruptions per hour of sleep. A higher AHI means more severe sleep apnea.
Once the results are ready, your sleep specialist will discuss them with you. If your sleep apnea diagnosis is confirmed, they will recommend treatment. For most people, that means CPAP or BiPAP therapy.
You can explore how CPAP and BiPAP therapy works to understand what treatment involves.
In Ontario, residents with a confirmed diagnosis may qualify for funding through the Assistive Devices Program (ADP). This program covers a portion of the cost of CPAP and BiPAP machines. InspiAIR handles all Ministry of Health paperwork and works with your private insurance on your behalf.
Finally, once you start treatment, your sleep specialist and your CPAP provider will follow up to make sure therapy is effective. You will be set up with a dedicated sleep coach app to ensure you have up to date information regarding your sleep data.
Treatment is not a one-time event. It is an ongoing process to help you sleep and feel better long-term.
You can also browse CPAP machines available through InspiAIR to get a sense of your options before your appointment.
Frequently Asked Questions About Sleep Apnea Diagnosis
How do I know if I need a sleep apnea test?
The most common signs are loud snoring, waking up gasping, and feeling exhausted even after a full night’s sleep. Morning headaches and difficulty concentrating during the day are also common.
If you have these symptoms, speak to your family doctor. They can refer you to a sleep specialist for a proper evaluation.
How long does it take to get a sleep apnea diagnosis?
The timeline varies. After your doctor’s referral, you may wait several weeks to see a sleep specialist and then additional weeks for your test and results.
Some private sleep clinics near you may offer faster access. In total, the process can take anywhere from one to four months.
Does OHIP cover sleep studies in Ontario?
Yes. OHIP covers the cost of sleep studies when ordered by a sleep specialist. Once you have a confirmed diagnosis, the Assistive Devices Program (ADP) will also contribute towards the cost of your CPAP machine. InspiAIR guides patients through all funding and insurance steps.
What is the difference between a sleep specialist and a sleep apnea doctor?
These terms are often used interchangeably. A sleep specialist is typically a respirologist, neurologist, or other physician who has additional training in sleep medicine. They diagnose and treat sleep disorders.
Your family doctor is not a sleep specialist but can refer you to one.
Take the First Step Toward a Diagnosis
A sleep apnea diagnosis begins with one step: talking to your doctor. From there, a sleep specialist will guide you through the right sleep disorder test and explain your results. Because treatment is highly effective, getting diagnosed is worth it.
If you are ready to move forward, contact InspiAIR to find a sleep clinic near you across Ontario. With 24 locations and virtual consultations available, expert help is closer than you think.
