A pulse oximeter typically consists of a small clip-like device that is placed on a finger or earlobe. The device emits light waves that pass through the blood. The amount of light that is absorbed by the blood is a measure of the oxygen saturation level.
The oxygen saturation level is the percentage of oxygen-carrying red blood cells in your blood. A normal oxygen saturation level is between 95% and 100%. If your oxygen saturation level is below 90%, it may be a sign of a serious medical condition, such as asthma, pneumonia, or heart failure.
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