Oxygen Saturation

TL;DR

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What is oxygen saturation...

Normal arterial blood oxygen saturation levels (sometimes referred to as 'sats') are 96–100 percent at sea level and should be above 92% at an altitude of 1,600 meters. A reading under 90 is considered low and called hypoxemia. Levels below 80 percent may compromise organ function and if prolonged can lead to cardiac arrest and ...

Pulse oximeter to measure at the fingertip (or an earlobe), measures peripheral oxygen saturation (SpO2). Most fitness trackers will also measure this.