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 to use a pulse oximeter

Does it matter which finger I place the SpO2 probe on?

Ideally, it is best to place the probe on a warm finger on the patient’s non-dominant hand so that the patient can still use their dominant hand without hindrance. For patients with decreased levels of consciousness (e.g. emerging from sedation), the middle finger is a good finger to place the probe because patients are less likely to scratch their face or eyes with this finger. However, if you are unable to get a good reading on this finger, try the other fingers or the other hand until a good waveform is obtained.

References: Lifebox Pulse Oximetry Learning Module

Keywords: finger, placement, location

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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’