Oxygen saturation

The extent to which the hemoglobin is saturated with oxygen. (Hemoglobin is an element in the bloodstream that binds with oxygen and carries it to the organs and tissues of the body.) A normal oxygen saturation of the blood leaving the heart to the body is 95 to 100 percent. The oxygen saturation of the blood returning to the heart after delivering oxygen to the body is 75 percent.

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