Blood oxygen levels help indicate lung health, as well as other conditions that happen in the body. Learn more about normal blood oxygen levels here.

Normal Ranges Most people have a normal resting pulse oximetry reading for oxygen saturation (SpO2) between 95% and 100%. This shows that your blood has an appropriate amount of oxygen.

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The latest study looked at 300 elderly women with no cognitive problems. They had a sleep study to measure oxygen levels and sleep quality and then were retested five years later.

The team reported the mice in the oxygen-restricted environment lived about 50% longer than the mice in normal oxygen levels, with a median lifespan of 23 weeks compared to 15 weeks.