UW News

Matthew Thompson


September 19, 2022

A smartphone’s camera and flash could help people measure blood oxygen levels at home

A hand holding a cellphone with one finger over the flash and the camera. The flash is shining through the finger and glowing red.

In a proof-of-principle study, University of Washington and University of California San Diego researchers have shown that smartphones are capable of detecting blood oxygen saturation levels down to 70%. This is the lowest value that pulse oximeters should be able to measure, as recommended by the U.S. Food and Drug Administration.