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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.
Normal Oxygen Saturation Levels. The percentage of oxygen saturation in the blood is referred to as 'sats'. For example, if the test results say that the value of your sats are 95%, this means that 95% of the hemoglobin present in your blood is oxygenated.