UCSD engineers study how a smartphone could someday help you track your blood oxygen level.
Engineers at UC San Diego and the University of Washington published a proof-of-concept study that showed a smartphone was capable of detecting blood oxygen levels almost on par with the industry standard medical device.
In the study, the researchers used a smartphone’s camera — with the flash on — to take a video of a person’s blood flow on one finger and track it with a pulse oximeter device on their other finger. The smartphone technique uses light to capture how the amount of oxygen in our blood changes colors. From there they used a machine learning algorithm that tracks the pattern of changes at different oxygen levels. During a 15-minute period, each participant breathed in a controlled mixture of oxygen and nitrogen to slowly reduce their oxygen levels to simulate the changes.
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