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Could a ring on your finger detect sleep apnea?

NCT ID NCT04121923

Diagnosis Sponsor: Belun Technology Company Limited Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested a wearable ring device (Belun Ring) to see if it can accurately screen for obstructive sleep apnea. 70 adults wore the ring during a standard overnight sleep test. The ring measures oxygen levels, pulse, and movement to estimate breathing disruptions. Researchers compared the ring's results to the standard sleep lab measurements to check its accuracy.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Belun Ring Pulse Oximeter (wearable device)
What this could lead to
If successful, this device could offer a simpler, more accessible way to screen for sleep apnea at home or in clinics.
What could go wrong
This is a small, completed validation study (70 participants). The device may not be as accurate as standard sleep lab tests, and results may not apply to people with certain lung or sleep disorders.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

70 people

The number who actually took part.

Started

Mar 2018

Finished

May 2019

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 90 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Subject must have the ability to understand and provide written informed consent. * Subject is 18 to 90 years of age. * Subject must be willing and able to comply with study procedures and duration. * Male or female of any race. Exclusion Criteria: * Subject requires oxygen therapy or noninvasive ventilation. * Subject has a current diagnosis of chronic obstructive pulmonary disorder (COPD), neuromuscular disease, periodic limb movement, or narcolepsy. * Compromised circulation, injury, or physical malformation of fingers, toes, hands, ears or forehead/skull or other sensor sites which would limit the ability to test sites needed for the study. (Note: Certain malformations may still allow subjects to participate if the condition is noted and would not affect the particular sites utilized.) * Subject is on medication known to interfere with heart rate, such as beta blockers, digoxin, or calcium receptor agonists. * Subjects with severe contact allergies to standard adhesives, latex or other materials found in pulse oximetry sensors, ECG electrodes, respiration monitor electrodes or other medical sensors (self-reported). * Unwillingness or inability to remove colored nail polish from test digits. * Other known health condition, which should be considered.

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Conditions

The condition(s) this trial relates to.

obstructive sleep apnea syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Sleep apnea, obstructive

Contacts and locations

Locations

  • Mountain Sleep Diagnostics

    Denver, Colorado, 80231, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.