«Oura, the company behind the Oura Ring lineup of wearable devices, today announced that blood oxygen sensing is rolling out to the third-generation Oura Ring. It’s a long time coming — Oura previewed the feature last fall. But Oura, asserting that the wait was worth it, says oxygen sensing will be able to deliver a “more comprehensive assessment of sleep health and physiology” to owners of its newest flagship product.»

«The third-generation Oura Ring measures blood oxygen, or SpO2, via red and infrared LED sensors that shine light into a wearer’s finger and use the reflections that bounce back to estimate how much oxygen is in the blood. Richly oxygenated blood reflects more red light than infrared light, while poorly oxygenated blood tends to reflect more infrared light than red light.»

«The technique is called pulse oximetry, and it’s long been a fixture of wearable devices from Fitbit, Garmin, Apple, Withings and others. Some studies have shown that pulse oximetry is relatively accurate. But experts caution that it’s not clinical grade. (In a blog post detailing the new SpO2 feature, Oura is quick to note that the metrics provided by the Oura Ring aren’t meant to diagnose conditions.)»

Article written by Kyle Wiggers.