Pulse Oximetry FAQ

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

Is it true that oximeters are not reliable below 70% SpO2?

Not necessarily. This commonly recited myth stems from the fact that oximeters are only tested in clinical validation studies down to 70% SpO2 due to the stated requirement by the FDA and also because of limitations by institutional review boards. So, while oximeters are not usually validated clinically below SpO2 70%, and oximeter performance becomes less accurate at lower SpO2, oximeter readings below 70% should not be disregarded. Widely inaccurate SpO2 values below ~SpO2 70% are more often due to poor signal in the context of a critically ill patient with poor perfusion, rather than an inherent limitation in inherent oximeter technology. 

Keywords: accuracy, inaccurate

You have additional questions?