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Low blood oxygen, known as hypoxemia, means that the level of oxygen in the blood has fallen below normal levels, due to one or more of many different causes. Under most circumstances, breathing room air, normal readings range from 95 to 100 percent.
Oxygen saturation refers to the level of oxygen found in a person's blood, as indicated by the Mayo Clinic's definition of hypoxemia. A healthy person's blood is maintained through a certain oxygen saturation range to adequately deliver oxygen to cells and tissues. Keep Learning.