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

Medically reviewed by Susan Russell, MDMedically reviewed by Susan Russell, MD Your blood oxygen level—sometimes referred to as SpO2—measures how much oxygen is circulating in your bloodstream.

Hypoxemia went undetected in 0.8% of critically ill Asian patients when oxygen saturation was measured via pulse oximetry (SpO2) vs SaO2.

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