Getting tested for sleep apnea starts with a screening conversation with your doctor, followed by either an overnight study at a sleep center or a portable test you take home. The process from your first appointment to a diagnosis typically takes a few weeks, and most insurance plans cover sleep testing when a doctor orders it based on your symptoms.
Signs That Should Prompt Testing
Before ordering a sleep study, most doctors use a standardized screening tool called the STOP-Bang questionnaire. It checks eight risk factors, each worth one point: loud snoring, daytime tiredness or fatigue, someone witnessing you stop breathing during sleep, high blood pressure (or treatment for it), a BMI over 35, age over 50, neck circumference greater than 40 centimeters (about 16 inches), and male sex. The more points you score, the higher your risk category. Even scoring on just a few of these warrants a conversation with your doctor about formal testing.
You don’t need to check every box. Many people seek testing because a partner notices pauses in their breathing at night, or because they’re exhausted during the day despite getting what seems like enough sleep. Waking up with headaches, difficulty concentrating, or irritability can also point toward disrupted breathing during sleep.
Who to See for a Referral
Your primary care doctor can order a sleep study directly. If your case is more complex, they may refer you to a sleep medicine specialist, which is a board certification that doctors from several backgrounds can hold. Pulmonologists, neurologists, psychiatrists, and even some dentists specialize in sleep disorders. Ear, nose, and throat surgeons and oral surgeons also treat sleep apnea, particularly when anatomy plays a role. At major medical centers like Mayo Clinic, dedicated sleep medicine departments coordinate diagnosis and treatment under one roof.
You don’t necessarily need a specialist referral to get started. Many primary care offices now order home sleep tests themselves, which can speed up the process significantly.
Home Sleep Test vs. In-Lab Study
There are two main ways to test for sleep apnea, and the right one depends on your health history and what your doctor suspects.
Home Sleep Apnea Testing
A home test is a simplified version of the full sleep study. You pick up a small device from your doctor’s office or a sleep center, take it home, and wear it for one or two nights in your own bed. It typically measures airflow through your nose, blood oxygen levels, breathing effort, and heart rate. Some devices also track body position and snoring sounds. The setup is straightforward: a sensor on your finger, a nasal cannula, and a chest strap.
Home tests work well for straightforward cases where obstructive sleep apnea is the primary concern. They’re less expensive, more convenient, and widely covered by insurance. However, they’re not appropriate for everyone. If you have other significant medical conditions like heart failure, chronic lung disease, or a suspected second sleep disorder (such as narcolepsy or restless leg syndrome), the home test may not capture enough data. In those cases, your doctor will recommend the in-lab version.
In-Lab Polysomnography
A lab-based sleep study, called polysomnography, is the most comprehensive test available. You spend one night at a sleep center, typically arriving in the evening and leaving the next morning. A technician attaches sensors to multiple locations on your body: electrodes on your scalp and behind your ears to measure brain waves, sensors near the outer corners of your eyes to track eye movement, and electrodes on your chin to record muscle activity. Two snap electrodes go on your chest to monitor heart rhythm, and elastic belts wrap around your chest and abdomen to measure breathing effort. An oxygen sensor clips onto your finger, and leg sensors are placed on each shin to detect limb movements.
A small thermistor and nasal cannula sit between your nose and upper lip to measure airflow. A position sensor records whether you’re sleeping on your back, side, or stomach. In total, the system tracks brain waves, eye movements, muscle tone, heart rate, breathing rate and effort, airflow, oxygen levels, body position, and leg movements. Some labs also use video cameras to document movement during sleep.
It sounds like a lot of wires, and it is. But the sensors are designed to let you move and sleep in different positions. Most people manage to fall asleep, even if it takes longer than usual. The technician monitors everything from another room throughout the night.
How to Prepare for Your Sleep Study
Whether you’re testing at home or in a lab, preparation is the same. Avoid caffeine, alcohol, and sleeping medications before the study, as all three can alter your sleep patterns and skew results. Caffeine can suppress the deeper stages of sleep, alcohol relaxes your airway muscles in ways that don’t reflect your typical night, and sedatives mask the natural arousals that the test is designed to detect.
Try to follow your normal routine otherwise. Shower before the study since the electrode adhesive sticks better to clean skin, but skip hair products like gels or leave-in conditioners. For an in-lab study, bring comfortable sleepwear and anything you’d normally use for your bedtime routine. You’ll have a private or semi-private room with a bed, and most centers allow you to read or watch TV until you’re ready to sleep.
What the Results Mean
After your study, a sleep specialist reviews the recorded data and scores it. The key number is your apnea-hypopnea index, or AHI, which counts how many times per hour your breathing fully stops (apnea) or partially drops (hypopnea) during sleep.
- Under 5 events per hour: Normal, no sleep apnea.
- 5 to 14 events per hour: Mild sleep apnea.
- 15 to 29 events per hour: Moderate sleep apnea.
- 30 or more events per hour: Severe sleep apnea.
Your doctor should contact you within a few days with results, though timelines vary by facility. In most cases, you’ll discuss the findings in detail at a follow-up visit, where your doctor will explain the severity and recommend treatment options based on your specific numbers, symptoms, and preferences.
If a home test comes back negative but your symptoms are strong, your doctor may order an in-lab polysomnography to get a more complete picture. Home tests can sometimes underestimate severity because they measure fewer signals and may miss events that a full lab study would catch.
Insurance and Cost
Medicare covers sleep testing when you have clinical signs and symptoms of sleep apnea and your doctor orders the study. Most private insurance plans follow similar criteria. You generally need documented symptoms, not just a hunch, and a physician’s order. Some insurers require you to try a home test first before approving the more expensive in-lab study.
Without insurance, home sleep tests typically cost a few hundred dollars, while in-lab polysomnography can run into the thousands. If cost is a concern, ask your doctor’s office about home testing as a first step, since it’s the less expensive option and is sufficient for diagnosing most cases of obstructive sleep apnea. Many sleep centers also offer payment plans or can provide cost estimates before you schedule.