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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.
Oximeters are commonly used these days in hospitals and by critical-care professionals to define blood oxygen levels and diagnose hypoxemia. On an average, the normal oxygen levels in our blood stream are about 85 mm Hg. In people suffering from hypoxemia, this falls down to as low as 60 mmHg. During hypoxemia, the oxygen saturation in the body is less than 90 percent. This is the formal definition of hypoxemia. Normal pulse oximeter readings can range from 95 to 100 percent.