Proof-of-principle study: Researchers have demonstrated that smartphones are capable of detecting blood-oxygen saturation levels down to 70%. Subjects place their finger over the camera and flash of a smartphone, which uses a deep-learning algorithm to decipher blood-oxygen levels from the resulting video. (Courtesy: Dennis Wise/University of Washington)
Blood-oxygen saturation (SpO2), the percentage of haemoglobin in the blood carrying oxygen, is an im
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Tami Freeman
is an online editor for Physics World