A healthy blood oxygen level is 95% to 100% on a pulse oximeter (SpO2) or 75 to 100 mm Hg on an arterial blood gas test. A reading below 95% is considered low and may warrant medical attention. Your ...

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 an ...

What does SpO2 actually measure? SpO2 is an estimate of the percentage of hemoglobin in your blood that is carrying oxygen.

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.

Your fitness tracker is capable of monitoring all kinds of data. The problem is keeping track of what it all means. SpO2 is just one example of a lesser-understood metric that can provide insight into ...

is a senior reporter and author of the Optimizer newsletter. She has more than 13 years of experience reporting on wearables, health tech, and more. Before coming to The Verge, she worked for Gizmodo ...