You can check for sleep apnea at home using a portable device called a home sleep apnea test (HSAT), which your doctor prescribes and you wear for one or two nights in your own bed. These devices measure your breathing, blood oxygen levels, and heart rate while you sleep, then generate a score that indicates whether you have sleep apnea and how severe it is. Before you get to that point, though, there are screening steps you can take right now to figure out if testing makes sense.
Signs That Suggest Sleep Apnea
The most recognizable sign of obstructive sleep apnea is loud snoring, particularly snoring that’s interrupted by silent pauses. Those pauses are moments when your airway has collapsed and you’ve temporarily stopped breathing. A bed partner who notices you gasping or choking during sleep is one of the strongest indicators. But many people with sleep apnea live alone and have no one to observe them, so daytime symptoms matter just as much.
During the day, sleep apnea typically shows up as excessive sleepiness that persists no matter how many hours you spend in bed. Morning headaches, waking with a dry mouth or sore throat, and needing to urinate frequently during the night are all common. If you regularly feel fatigued, irritable, or have trouble concentrating despite what should be enough sleep, sleep apnea is worth investigating.
Screen Yourself With the STOP-BANG Questionnaire
Before ordering any device, most doctors use a validated screening tool called the STOP-BANG questionnaire. It takes about two minutes, and you can score it yourself right now. Answer yes or no to each of these eight questions:
- Snoring: Do you snore loudly enough to be heard through a closed door?
- Tired: Do you often feel tired, fatigued, or sleepy during the day?
- Observed: Has anyone seen you stop breathing while you sleep?
- Pressure: Do you have or are you being treated for high blood pressure?
- BMI: Is your BMI over 35?
- Age: Are you over 50?
- Neck: Is your neck circumference greater than 40 cm (about 16 inches)?
- Gender: Are you male?
Answering yes to three or more puts you in the high-risk category for obstructive sleep apnea. A score of 5 to 8 indicates a high probability of moderate or severe sleep apnea specifically. This score won’t diagnose anything on its own, but it gives you and your doctor a concrete reason to move forward with a home sleep test.
What a Home Sleep Test Actually Measures
Home sleep tests come in two main categories. The more common type (called a Type 3 device) records four to six signals: airflow through a nasal cannula, respiratory effort from chest and abdominal belts, blood oxygen saturation from a finger clip, and heart rate. You’ll typically strap on a small chest unit, place a thin tube under your nose, and clip a sensor onto your finger before going to bed as you normally would.
The other common option uses a technology called peripheral arterial tonometry, which works differently. Instead of a nasal cannula, you wear a probe on your fingertip that detects changes in blood flow. When your breathing stops during sleep, your nervous system responds with a burst of activity that constricts blood vessels in your fingertips. The device picks up these tiny fluctuations in vascular tone, along with oxygen levels and movement data, to identify breathing events. This type of test is simpler to set up since there’s nothing on your face.
Simpler devices (Type 4) measure just one or two signals, usually oxygen saturation alone or oxygen plus airflow. These are less comprehensive but still used in some cases.
Understanding Your Results: The AHI Score
The key number from any sleep test is your Apnea-Hypopnea Index, or AHI. This counts how many times per hour your breathing partially or completely stops during the night. Each pause (an apnea) or significant reduction in airflow (a hypopnea) counts as one event.
The severity ranges are straightforward. An AHI of 5 to 14 events per hour is mild sleep apnea. An AHI of 15 to 29 is moderate. An AHI of 30 or more is severe. Below 5 is considered normal. These numbers directly affect what treatment options are available to you and what your insurance will cover.
How Accurate Are Home Tests?
Home sleep tests are reasonably accurate but not perfect. Compared to a full overnight study in a sleep lab (polysomnography), home tests have an overall accuracy around 80%, with a sensitivity of about 77% and a specificity near 89%. In practical terms, that means home tests are better at confirming you don’t have sleep apnea than at catching every case. They tend to underestimate the AHI because they measure total recording time rather than actual sleep time. If you were lying awake for two hours but the device counted that as sleep, your breathing events get spread across more hours, lowering your score.
This is why home tests work best for people who already have a high likelihood of moderate to severe sleep apnea based on symptoms and screening scores. If your home test comes back normal but your symptoms are significant, your doctor will likely recommend an in-lab study to get a more detailed picture.
How to Get a Home Sleep Test
You can’t simply buy a medical-grade home sleep test over the counter. The process starts with a visit to your primary care doctor or a sleep specialist, who evaluates your symptoms, risk factors, and medical history. This comprehensive sleep evaluation is a requirement for insurance coverage. Medicare and most private insurers cover home sleep tests when there’s a high pretest probability of moderate to severe obstructive sleep apnea.
There are some important limitations. Insurance generally will not cover a home sleep test if you have moderate to severe lung disease, neuromuscular disease, or congestive heart failure, because these conditions can complicate the results and typically require in-lab monitoring. Home tests are also only approved for diagnosing obstructive sleep apnea specifically, not central sleep apnea, restless leg syndrome, narcolepsy, or other sleep disorders. If your doctor suspects something beyond obstructive sleep apnea, you’ll be sent to a lab. Most insurers also won’t cover more than one home test per year without documented justification.
Once prescribed, some clinics mail the device to you with instructions, and others have you pick it up. You wear it for one night (sometimes two if the first night’s data is unclear), then return it. Results are typically available within a week.
What Happens After a Positive Result
If your home test confirms obstructive sleep apnea, the AHI score determines your path forward. For an AHI of 15 or higher with at least 30 recorded events, you qualify for a CPAP (continuous positive airway pressure) device through insurance without additional documentation. For milder cases, with an AHI between 5 and 14, you can still qualify for CPAP, but your doctor needs to document at least 10 events plus related symptoms like excessive daytime sleepiness, impaired concentration, insomnia, or conditions such as high blood pressure, heart disease, or a history of stroke.
Some people with borderline or inconclusive home test results are sent for a full in-lab polysomnography, which monitors brain waves, eye movements, and muscle activity in addition to breathing. This provides a more complete picture and can catch cases that a home test missed. The in-lab study is also used to calibrate CPAP pressure settings, though many modern machines auto-adjust.
Consumer Devices vs. Medical-Grade Tests
Smartwatches, phone apps, and consumer-grade oxygen monitors can track snoring sounds, blood oxygen dips, and movement patterns overnight. These tools can give you useful clues. If your smartwatch consistently shows oxygen drops into the low 80s or high 70s during sleep, that’s a meaningful red flag worth bringing to your doctor. But consumer devices cannot generate a clinically valid AHI, and no insurance company or prescribing physician will accept their data in place of a proper home sleep test. Think of them as a first step in building your case for formal testing, not a substitute for it.