Measure the oxygen level of your blood
Discover how much oxygen is in your blood and get an early warning of lung and heart problems
If you have an Apple Watch Series 6 or the latest Series 7, then so long as you are aged 18 and over, you can use it to measure the oxygen level of your blood. It’s a simple, painless process using the optical heart sensor on the back of the device. By shining red and green LEDS and infrared light, then assessing the amount of light reflecting back, the Watch is able to measure arterial oxygen saturation within a few seconds.