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.

Monitoring your oxygen level with a pulse oximeter if you have COVID-19 can help determine if it falls too low. Low levels may need medical attention. COVID-19 is a respiratory infection. It can cause ...

Decreased cardiac output is when your heart can no longer pump enough oxygen to meet the demands of your body. A rapid heart rate is a common symptom, but there are others, too. Your heart is ...

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 ...