How pulse oximeters work Archives

Pulse Oximetry FAQ

This FAQ has been compiled by our team of experts. Please submit your questions at the bottom of this page!

Pulse Oximetry FAQ

How pulse oximeters work

Can pulse oximeters measure volume responsiveness?

How does a pulse oximeter work?

What are the different types of pulse oximeter?

What does a normal pulse oximeter photoplethysmograph look like?

What is CO-oximetry?

What is spectrophotometry?

What is the difference between transmittance and reflectance pulse oximeters?

When was the first pulse oximeter developed?

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Healthy Human Performance Tests

To meet ISO standards (80601-2-61) or FDA guideline adherence for clinical use, pulse oximeter performance must be tested in healthy humans in a laboratory setting. Independent device testing for the Open Oximetry Project follows our protocol consistent with ISO and FDA. Only devices labeled as ‘verified’ or ‘disputed’ have been independently tested by the Open Oximetry Project.
All other devices listed show data from manufacturers or published literature and have not been confirmed by the Open Oximetry Team. Scoring criteria will be modified based on evolving data on this topic. See the table below for scoring criteria for this category:

No Data

1 (red)

>4%

2 (red)

<4%

AND/OR Data suggesting Arms for dark skin color of >4%

AND/OR Data suggesting Arms for PI<1 in dark or light skin color of >4%

3 (yellow)

<4%

AND/OR Data suggesting Arms for dark skin color of 3-4%

AND/OR Data suggesting Arms for PI<1 in dark or light skin color of 3-4%

4 (green)

<3%

AND No data for or against performance problems in darker skin colors

AND No data for or against performance problems in low perfusion

5 (green)

<3%

AND Extended testing beyond ISO/FDA recommendations Criteria TBD April 2023

* only independently tested devices by OpenOximetry (Hypoxia Lab and Clinimark) get labeled as ‘verified’