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Peripheral blood oxygen saturation Sp02 is a vital measure in healthcare.Modern off-the-shelf wrist-worn devices, such as the Apple Watch, FitBit, andSamsung Gear, have an onboard sensor called a pulse oximeter. While pulseoximeters are capable of measuring both Sp02 and heart rate, current wrist-worndevices use them only to determine heart rate, as Sp02 measurements collectedfrom the wrist are believed to be inaccurate. Enabling oxygen saturationmonitoring on wearable devices would make these devices tremendously moreuseful for health monitoring and open up new avenues of research. To the bestof our knowledge, we present the first study of the reliability of Sp02 sensingfrom the wrist. Using a custom-built wrist-worn pulse oximeter, we find thatexisting algorithms designed for fingertip sensing are a poor match for thissetting, and can lead to over 90% of readings being inaccurate and unusable. Wefurther show that sensor placement and skin tone have a substantial effect onthe measurement error, and must be considered when designing wrist-worn Sp02sensors and measurement algorithms. Based on our findings, we propose\codename, an alternative approach for reliable Sp02 sensing. By selectivelypruning data, \codename achieves an order of magnitude reduction in errorcompared to existing algorithms, while still providing sufficiently frequentreadings for continuous health monitoring.

Wrist02 -- Reliable Peripheral Oxygen Saturation Readings from Wrist-Worn Pulse Oximeters