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.

Medical terms like blood oxygen, spO2 levels, and oxygen saturation became more popular during the peak COVID-19 pandemic. The Delta variant had taken a massive toll on the population, leading to ...

A dangerously low oxygen level—usually below 92%—can cause shortness of breath, confusion, chest pain, or fainting. It’s ...