When SpO2 dips into the low 90s or below ... you're measuring your own blood oxygen levels at home or you're at a medical practitioner's, you'll typically use something called a pulse oximeter ...

SpO2 readings can fluctuate based on activity ... Examples of low blood oxygen symptoms that may signal a medical emergency ...

Apple introduced blood oxygen sensing with the Apple Watch Series 6 back in 2020, where it was seen as a key health addition.

A new study has revealed that Apple Watch Series 6 "is a reliable way to obtain heart rate and oxygen saturation (SpO2) in patients with lung diseases under controlled conditions". The study ...