COVID-19 Resources: Keeping you safe | Vaccine Information | Visitor Policy and Hours
View All Services
Find a New Primary Care Provider
Search by Specialty
View All Locations
Discover classes, events, tours, and groups that fit your interests.
Home > Be Healthy > Health Library > Oxygen saturation
Oxygen saturation refers to the amount of oxygen being carried in the red blood cells, which load up with oxygen in the lungs and then transport it to the rest of the body. People who have medical conditions, such as lung disease, may not have enough oxygen in their red blood cells.
Oxygen saturation can be measured by a device called an oximeter. Oxygen saturation of less than 90% is a sign that the lungs and heart are not working well.
Current as of: July 6, 2021
Author: Healthwise Staff
Medical Review:Anne C. Poinier MD - Internal Medicine & Adam Husney MD - Family Medicine & Mark A. Rasmus MD - Pulmonology, Critical Care Medicine, Sleep Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2021 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.