Checking for sleep apnea starts with recognizing the symptoms and risk factors, then progresses to a formal sleep study that measures how many times your breathing stops per hour. You can begin the process at home by tracking your own symptoms and using a validated screening questionnaire, but a definitive diagnosis requires either an in-lab sleep study or a portable home test prescribed by a doctor.
Signs You Should Be Checking For
Sleep apnea often goes undiagnosed because its most obvious symptom, pauses in breathing, happens while you’re asleep. Most people learn about it from a bed partner who notices them stop breathing, gasp, or choke during the night. If you sleep alone, you’ll need to pay attention to the daytime clues your body gives you.
Nighttime symptoms include waking up gasping or choking, snoring loudly (especially snoring that stops and starts), and needing to urinate frequently overnight. During the day, the hallmarks are morning headaches, excessive sleepiness no matter how many hours you slept, difficulty concentrating, and irritability. Not everyone with sleep apnea snores, and not everyone who snores has sleep apnea, but loud, irregular snoring combined with daytime fatigue is the most common pattern.
A Quick Self-Screening You Can Do Now
The Epworth Sleepiness Scale is a simple questionnaire used by sleep clinics worldwide. It asks you to rate, on a scale of 0 to 3, how likely you are to doze off in eight common situations: sitting and reading, watching TV, sitting in a meeting, riding as a passenger in a car, lying down in the afternoon, sitting and talking to someone, sitting quietly after lunch, and sitting in stopped traffic. Your total score ranges from 0 to 24.
A score of 0 to 10 is considered normal daytime sleepiness. Scores of 11 to 12 suggest mild excessive sleepiness, 13 to 15 is moderate, and 16 to 24 is severe. If you score 11 or higher, that’s a signal worth bringing to your doctor. The scale doesn’t diagnose sleep apnea on its own, but it gives you and your provider a concrete number to work with.
Physical Risk Factors You Can Measure
Certain body measurements increase the likelihood of obstructive sleep apnea. Neck circumference is one of the most reliable: a neck larger than 17 inches in men or 16 inches in women is a recognized risk factor. You can measure this at home with a flexible tape measure wrapped around the thickest part of your neck, just below your Adam’s apple.
Other risk factors include a BMI over 30, being male (though women’s risk rises after menopause), having a family history of sleep apnea, and having a naturally narrow airway. During a clinical exam, your doctor may look at how crowded your throat appears when you open your mouth. If they can see your full soft palate and uvula, your airway is relatively open. If only the roof of your mouth is visible, you have a more crowded airway that’s more prone to collapsing during sleep.
The Home Sleep Test
If your symptoms and risk factors point toward sleep apnea and you don’t have other complicating medical conditions, your doctor may prescribe a home sleep apnea test. This is a small portable device you pick up from a sleep clinic or receive by mail. You wear it for one or two nights in your own bed.
A typical home kit includes a sensor that clips onto your finger to measure blood oxygen levels, a belt or strap around your chest to track breathing effort, and a nasal cannula to detect airflow. Some devices also include a sensor to record your body position, since many people only stop breathing when lying on their back.
The key limitation of home tests is that most don’t measure brain waves, which means they can’t track your sleep stages or precisely determine when you’re awake versus asleep. This matters because the main diagnostic number, the apnea-hypopnea index, is calculated per hour of sleep. Without brain wave data, the device estimates sleep time rather than measuring it directly, which can occasionally undercount the severity of your condition.
Home sleep tests typically cost between $150 and $1,000. Insurance generally covers them when a doctor deems the test medically necessary. Medicare covers 80% of the cost after your deductible, and Medicaid also covers home tests for suspected obstructive sleep apnea.
The In-Lab Sleep Study
A polysomnography, the full overnight sleep study conducted in a clinic, is the gold standard for diagnosing sleep apnea. You spend a night in a private room at a sleep center while technicians monitor a wide range of body signals.
Sensors placed on your scalp record brain waves, which is what sets this test apart from the home version. Small sensors near your eyes track rapid eye movement to identify REM sleep, when your muscles are most relaxed and apnea episodes tend to be worst. Electrodes on your chin and legs detect muscle activity. A pulse oximeter on your finger tracks oxygen levels, chest and abdominal belts measure breathing effort, and position sensors record whether you’re on your back, side, or stomach. Heart rate and rhythm are monitored throughout.
An in-lab study is typically recommended when a home test comes back inconclusive, when your doctor suspects central sleep apnea (a less common type driven by the brain rather than airway collapse), or when you have other conditions like heart failure or chronic lung disease that could complicate the results.
Understanding Your Results
Both home and in-lab tests produce an apnea-hypopnea index, or AHI. This number tells you how many times per hour your breathing fully stopped (apnea) or was significantly reduced (hypopnea) during the test. The American Academy of Sleep Medicine uses these ranges for adults:
- Fewer than 5 events per hour: Normal
- 5 to fewer than 15: Mild sleep apnea
- 15 to fewer than 30: Moderate sleep apnea
- 30 or more: Severe sleep apnea
Your oxygen levels matter too. The study tracks how low your blood oxygen drops during each breathing pause and how much of the night you spend below normal levels. Someone with a moderate AHI but deep oxygen drops may need more aggressive treatment than those numbers alone suggest.
What the Process Looks Like Start to Finish
The typical path begins with your primary care doctor or, in some cases, a dentist or cardiologist who notices signs during a routine visit. You describe your symptoms, they assess your risk factors, and if sleep apnea seems likely, they write a referral for a sleep study. Some insurance plans require a referral from your primary care doctor before covering the test, so check your plan’s requirements before booking directly with a sleep clinic.
Patients with a high probability of obstructive sleep apnea and no other major medical conditions are usually good candidates for the home test as a first step. If the home test confirms moderate or severe apnea, that’s often enough to start treatment. If results are borderline or don’t match your symptoms, your doctor may send you for a full in-lab study.
After the test, you’ll have a follow-up appointment to review results and discuss treatment options. For moderate to severe cases, the most common next step is a positive airway pressure device that keeps your airway open during sleep. Mild cases may be managed with positional therapy, a dental appliance, weight loss, or a combination.
Can Smartwatches or Phone Apps Detect It?
Several consumer devices now claim to track blood oxygen overnight, and some smartphone apps use your phone’s microphone to detect snoring patterns. These tools can give you a rough sense of whether something unusual is happening during sleep, but they are not diagnostic. A smartwatch oxygen sensor sits on your wrist rather than your fingertip, which makes it less accurate for detecting brief drops in oxygen. Snoring apps can confirm that you snore but can’t distinguish between simple snoring and the airway collapse that defines apnea.
If your wearable consistently shows overnight oxygen dips below 90%, or a recording app captures long pauses in your breathing followed by gasps, those are useful data points to bring to your doctor. They can accelerate the referral process. But no consumer device can replace a scored sleep study that counts breathing events per hour and produces an AHI.