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Smartwatches put to the test: can they match medical oxygen monitors?

NCT ID NCT05789563

Knowledge-focused Sponsor: Czech Technical University in Prague 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study compared blood oxygen readings from three different smartwatch models against a standard medical pulse oximeter. Eighteen healthy adults breathed low-oxygen mixtures to simulate hypoxia while wearing a smartwatch and a reference oximeter. The goal was to see how well the smartwatches agree with the medical device.

What this could mean

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

What this could lead to
If the smartwatches prove accurate, they could become a reliable tool for people to monitor their blood oxygen levels at home.
What could go wrong
This was a small study with only 18 healthy participants, so results may not apply to people with health conditions or in real-world settings.

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

18 people

The number who actually took part.

Started

Mar 2023

Finished

Jun 2023

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 30 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: * Passing the initial examination, which will determine the following data: wrist circumference, heart rate, blood pressure and blood oxygen saturation Exclusion Criteria: * pregnancy * severe cardiovascular conditions * severe asthma or other severe respiratory conditions * injury to the upper limbs or hands that could affect the peripheral perfusion * diabetes * hypotension or hypertension

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Conditions

The condition(s) this trial relates to.

Hypoxia

As listed by the trial registrant

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

Hypoxia

Contacts and locations

Locations

  • Czech Technical University in Prague

    Kladno, 27201, Czechia

More trials for these conditions

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