Normal blood oxygen levels mean that there is enough oxygen in your red blood cells to keep your vital organs and tissues functioning properly. You can easily check your blood oxygen levels with ...

By contrast, a healthy person should have blood oxygen levels of at least 95%, and typically require medical attention if those levels drop below 90%. In its current form, the app is able to ...

The ability to measure blood oxygen levels is dropping from the Apple Watch Series 9 and Watch Ultra 2. Apple is making the change to comply with a ruling by the International Trade Commission.