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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.
How to Measure Blood Oxygen. Pulse oximetry and arterial blood gas tests are methods to measure how much oxygen is in your blood. Normal oxygen saturation levels range from 97% to 99% in healthy people. When your blood oxygen is too low, it's called hypoxemia.