What does "O2 saturation" 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.
O2 saturation refers to the level of oxygen in a person's blood. It's a measure of how much oxygen the red blood cells are carrying compared to their maximum capacity. A high O2 saturation means that a lot of oxygen is being carried to the body's tissues, while a low O2 saturation means that not enough oxygen is being delivered. This measurement is often used by doctors to check a person's lung and heart health.
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