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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.
A pulse oximeter indicates the level of oxygen saturation of the hemoglobin in the blood, referred to as SpO2. The test is usually performed on the index finger, measurements being taken at the capillary level. Results can be used to diagnose poor binding between oxygen and hemoglobin, or other hematological problems.