WatchPAT is an innovative Home Sleep Apnea Test (HSAT) that utilizes the peripheral arterial tonometry for Sleep Apnea diagnosis.  It measures up to 7 channels peripheral arterial tonometry signal, heart rate, oximetry, actigraphy, body position, snoring, and chest motion via three points of contact. Within one minute post-study, the raw data is downloaded and auto-scored identifying all types of sleep apnea events. WatchPAT home sleep apnea test provides AHI, AHIc, RDI, and ODI based upon Total Sleep Time and Sleep Staging. The WatchPAT  Sleep Apnea Test (HSAT) is clinically validated with an 89% correlation to PSG¹. The peripheral arterial tonometry signal was included in the 2017 AASM Clinical Practice Guidelines as technically adequate.