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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 is a clinical measurement that determines what percentage of a patient's red blood cells are saturated with oxygen after passing through the lungs. It is a result that reflects not only how well a patient's lungs are working but also how effectively oxygen is being delivered to all parts of the body.