Comparison of SpO2 Measurement Accuracy of Different Types of Smartwatches (CSMADTS)

March 10, 2026 updated by: Czech Technical University in Prague
The aim of the study is to compare the accuracy of peripheral blood oxygen saturation measurements using smartwatches from three manufacturers compared to a standard medical pulse oximeter.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The aim is to create a study that compares multiple smartwatch models simultaneously with a standard medical pulse oximeter using a single measurement methodology. According to the available literature, no such study exists. The methodology of the study and the subsequent statistical evaluation are based on the guidelines of the standard ČSN EN ISO 80601-2-61, which specifies requirements for the basic safety and necessary functionality of pulse oximetry devices. The comparison will be performed non-invasively in healthy volunteers during gradual desaturation in the range of 70-100 % SpO2 (normobaric hypoxia). The data obtained could help to increase the awareness of the possibilities of SpO2 monitoring using smartwatches in medical conditions that are manifested by a decrease in SpO2 level over a longer time period, where measurement with a conventional oximeter is impractical.

Study Type

Interventional

Enrollment (Actual)

18

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Czechia
      • Kladno, Czechia, 27201
        • Czech Technical University in Prague

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 30 years (Adult)

Accepts Healthy Volunteers

Yes

Description

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

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: First smartwatch model
Volunteers sequentially inhale three hypoxic gas mixtures each for 2.5 minute. Every measurement will begin with a two-minute stabilization phase, during which the physiological values of the volunteer will be checked. During the experiment, SpO2 measurements will be taken by hand from the watch and the pulse oximeter simultaneously.
Other: Hypoxia and Smartwatch model
Breathing mixtures of O2 (14 %, 12 %, 10 %) balanced with N2 and monitoring SpO2 by one of the smartwatch models on left wrist and by pulse oximeter on left index finger.
Experimental: Second smartwatch model
Volunteers sequentially inhale three hypoxic gas mixtures each for 2.5 minute. Every measurement will begin with a two-minute stabilization phase, during which the physiological values of the volunteer will be checked. During the experiment, SpO2 measurements will be taken by hand from the watch and the pulse oximeter simultaneously.
Other: Hypoxia and Smartwatch model
Breathing mixtures of O2 (14 %, 12 %, 10 %) balanced with N2 and monitoring SpO2 by one of the smartwatch models on left wrist and by pulse oximeter on left index finger.
Experimental: Third smartwatch model
Volunteers sequentially inhale three hypoxic gas mixtures each for 2.5 minute. Every measurement will begin with a two-minute stabilization phase, during which the physiological values of the volunteer will be checked. During the experiment, SpO2 measurements will be taken by hand from the watch and the pulse oximeter simultaneously.
Other: Hypoxia and Smartwatch model
Breathing mixtures of O2 (14 %, 12 %, 10 %) balanced with N2 and monitoring SpO2 by one of the smartwatch models on left wrist and by pulse oximeter on left index finger.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Similarity of SpO2 readings
Time Frame: Under 1 hour
The agreement of SpO2 measurements of every model of smartwatches and reference pulse oximeter will be evaluated
Under 1 hour

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Czech Technical University in Prague

Investigators

  • Principal Investigator: Jakub Rafl, PhD., Czech Technical University in Prague

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 17, 2023

Primary Completion (Actual)

April 30, 2023

Study Completion (Actual)

June 28, 2023

Study Registration Dates

First Submitted

March 16, 2023

First Submitted That Met QC Criteria

March 16, 2023

First Posted (Actual)

March 29, 2023

Study Record Updates

Last Update Posted (Actual)

March 11, 2026

Last Update Submitted That Met QC Criteria

March 10, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • NVT_01_2023

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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