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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.
exists and is an alternate of . Oxygen saturation refers to the fraction of hemoglobin that is saturated by oxygen. It is related to the partial pressure of oxygen in the inspired air and, therefore, to altitude. Normal oxygen saturation in an otherwise healthy individual at sea level is > 95%.