What does "SaO2" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
SaO2 stands for arterial oxygen saturation. It's a measure of the amount of oxygen that is attached to red blood cells in the arteries, which are the blood vessels that carry blood away from the heart. The higher the SaO2 value, the more oxygen is available to be used by the body's cells. It's usually expressed as a percentage, with normal levels typically between 95% and 100%.
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