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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.
Measurement Reveals Degree of Oxygen Levels Drop in Sleep Apnea. The oxygen desaturation index (ODI) is a measurement in a sleep study used to identify sleep apnea that causes oxygen levels to drop. Images Bazaar/Getty Images.