Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Apple will deliver a software update for recent US Apple Watch models to reimplement the ability to measure blood oxygen levels, a process known as pulse oximetry.… Pulse oximetry can be helpful when ...

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If someone’s blood oxygen level falls below 60 mm Hg, there may not be enough oxygen reaching the body’s vital organs. This can lead to symptoms such as shortness of breath and dizziness. This article ...