Domain deep-dive
Sleep tests, apnea tests & digital tools
Wearables are great at flagging sleep problems — but a watch can't diagnose sleep apnea. Here's the ladder from a consumer alert to a real medical diagnosis, and the tools at each rung. See the sleep-domain devices →
Consumer wearable screening Risk flag, not a diagnosis
Sleep-apnea features on the Apple Watch, Samsung Galaxy Watch, and similar devices are FDA-authorized to assess risk of or notify about possible sleep apnea — explicitly not to diagnose it. A wearable alert is a doorbell, not a verdict: it can say "you may be at risk — go get checked." Sleep rings (Oura, Whoop) track sleep trends but are not FDA-cleared apnea screeners.
Home Sleep Apnea Test (HSAT) Prescription · interpreted by a physician
An HSAT is a real medical test you do in your own bed, ordered by a clinician and read by a sleep physician. It typically measures airflow, breathing effort, blood oxygen, and heart rate — but most HSATs don't record brain waves, so they estimate severity from monitoring time rather than true sleep time and can underestimate how severe apnea is. If a home test is negative, inconclusive, or technically poor, an in-lab study should follow.
In-lab polysomnography (PSG) The gold standard
An overnight, technician-supervised study in a sleep lab. It records brain waves, eye movement, and muscle activity — the signals needed to tell real sleep from wake — alongside airflow, effort, oxygen, heart rhythm, position, and limb movement. Because it measures true sleep, it grades severity precisely and catches events simpler tests miss.
Home tests & digital tools you can actually get
Where wearables fit
Consumer wearables are genuinely useful for flagging elevated risk and tracking trends night over night — which gets people who'd never have sought care to finally do so. But a positive screen is a starting line, not a finish line: it should lead to a clinician-ordered HSAT or an in-lab PSG that can actually diagnose and grade the condition. The American Academy of Sleep Medicine is explicit that consumer sleep devices are not able to diagnose sleep disorders, and that anyone with persistent sleep problems or daytime sleepiness should see a licensed provider — whatever a wearable says.