Do Oxygen Levels Fluctuate?

It's normal for oxygen saturation levels to fluctuate with activity. If your oxygen saturation level runs low on an ongoing basis, whether at rest, during activity or while you sleep, talk to your health care provider about using supplemental oxygen.

When should I be concerned about my oxygen level?

Your blood oxygen level is measured as a percentage—95 to 100 percent is considered normal. “If oxygen levels are below 88 percent, that is a cause for concern,” said Christian Bime, MD, a critical care medicine specialist with a focus in pulmonology at Banner - University Medical Center Tucson.

Do oxygen levels drop at night?

Everyone's oxygen levels in the blood are lower during sleep, due to a mildly reduced level of breathing. Also, some alveoli drop out of use during sleep.