
Oxygen saturation can be measured regionally and non-invasively. Arterial oxygenation is commonly measured using pulse oximetry. Tissue saturation at peripheral scale can be measured using NIRS. This technique can be applied on both muscle and brain. Our modern understanding of how oxygen dissolves in water comes from the work of Dr. Ray Weiss. .....
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http://en.wikipedia.org/wiki/Oxygen_saturation
[medicine] Oxygen saturation is a term referring to the concentration of oxygen in the blood. The human body requires and regulates a very precise and specific balance of oxygen in the blood. Normal blood oxygen levels in humans are considered 95-100 percent. If the level is below 90 percent, it is considered low resulting in hypoxemia. Blo...
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http://en.wikipedia.org/wiki/Oxygen_saturation_(medicine)

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...
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc
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