The oxygen-sensing device pictured on a fingertip. (Courtesy: Soner Sonmezoglu, University of California, Berkeley) Every part of our body needs oxygen to survive, produce energy and function. This is ...

The blood oxygen sensor featured in Apple Watch Series 6 and 7 is “not intended for medical use,” Apple says. That seems odd, considering that low blood oxygen is a serious medical condition. If the ...

Both the Apple Watch Series 6 and Fitbit Sense have new blood-oxygen apps, but The Washington Post's Geoffrey Fowler says they’re mostly useless. (Video: Jonathan Baran/The Washington Post) Sometimes ...