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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.
Low Blood Oxygen. The oxygen levels in blood can be measured by two means - first checking the arterial blood gas by resorting to a blood test, and second, by using a pulse oximeter (a device which is clipped on to the finger and to take oxygen readings in the blood).