WatchPAT – Home Sleep Testing Made Simple

WatchPAT is an FDA-approved portable diagnostic device that uniquely uses finger based physiology and innovative technology to enable simple and accurate Obstructive Sleep Apnea (OSA) testing while avoiding the complexity and discomfort associated with traditional air-flow based systems.

Thanks to its innovative use of technology, WatchPAT offers unparalleled performance, reliability and satisfaction – for both patients and healthcare professionals:

The Easiest to Use Home Sleep Test:

WatchPAT is worn like a simple wrist-watch, with no need for belts, wires or nasal cannulas. The simple and intuitive use leads to outstanding compliance and minimal failure rate (< 1%).

  • The Most Clinically Validated Home Sleep Test:

WatchPAT was extensively validated against in-lab PSG (“the gold standard”), with a documented correlation of 90%[1].

  • Accurate & Comprehensive:

WatchPAT is the only (non-EEG) HST that measures “True Sleep Time” (rather than total recording time) and provides complete sleep architecture.

  • Advanced Proprietary Technology:

WatchPAT operates on Peripheral Arterial Tone (PAT) signal. PAT measures the arterial volume changes at the fingertip, reflecting the sympathetic nervous system activation.

  • Cost-Effective:

WatchPAT requires minimal cleaning, preparation or handling before and after patient use and saves valuable staff time. Fully automated reports are generated within minutes, further increasing workflow efficiencies and treatment turnaround.

cost efficent

WatchPAT’s Clinical Parameters:

simple accurate and reliable


True Sleep Time:

 The WatchPAT calculates AHI based on the patient’s True Sleep Time (TST). undiluted respiratory events enable the WatchPAT to perform a more sensitive and accurate diagnosis. True Sleep Time improves the accuracy of the respiratory indices, test sensitivity and specificity.

True Sleep Time decreases the risk of misdiagnosis in up to 20% of patients[2].


PAT Signal Explained:

 The proprietary PAT signal is a non-invasive measure of the arterial pulsatile volume changes at the fingertip. PAT signal is a surrogate of changes in the sympathetic nervous system that are associated with Sleep Disordered Breathing (SDB) events and specific “signatures” of sleep stages. The WatchPAT has an embedded advanced actigraphy that when coupled with PAT signal enables the separation between sleep and wake periods and thus provides accurate True Sleep Time.
PAT signal attenuation, and acceleration pulse rate- directly reflect immediate digital arteries vasoconstriction and increase heart rate. Both of which, are direct indicators of arousals and micro-arousals that are part of the SDB underlying mechanism and present in each such event.
When further enhanced with oxygen blood desaturations and resaturations measured with the embedded pulse oximeter sensor, the proprietary algorithm accurately calculates the SDB clinical parameters such as AHI, EDI and ODI that utilize True Sleep Time and Complete Sleep Architecture (Deep, Light and REM), providing the physician with a full comprehensive assessment of the patient.

sleep stages

Improving Patient Flow Management

 zzzPAT Software:

The zzzPAT is a proprietary PC or server-based analysis software used with the WatchPAT device.  The software’s advanced algorithm is automatic, eliminating the need for subjective manual scoring of respiratory events. If needed, the software also enables manual scoring for compliance with AASM standards.  A comprehensive sleep study report is generated within minutes after downloading the study data, allowing patients to initiate treatment without delay.

CloudPAT Platform

CloudPAT is a HIPAA-compliant web-based cloud application that allows users to streamline their workflow electronically, without having to operate or maintain an in-house solution.

CloudPAT provides instant access to comprehensive study reports from any online location, as well as the option of sending studies for interpretation by a certified sleep physician.


Understanding the Sleep Study

 sleep rep

Clinical Evidence- Add Meta Analysis Diagnosis of Obstructive Sleep Apnea by Peripheral Arterial Tonometry


[1] Yalamanchali S, Farajian V, Hamilton C, Pott TR, Samuelson CG, Friedman M. Diagnosis of obstructive sleep apnea by peripheral arterial tonometry: meta-analysis. JAMA Otolaryngol Head Neck Surg. December 2013;139(12):1343-1350
[2] Rodin et al. Comparison of AHI Using Recording Time Versus Sleep Time Schutte. J Sleep Abs supl 2014, p. A373


Back to main WatchPAT page
WatchPAT Key features
Obstructive Sleep Apnea (OSA)
PAT (Peripheral Arterial Tone) Technology
CloudPAT – Web-based Sleep Diagnostics Made Easy
Case Studies
For Cardiologists
For Dentists