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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.
Quick Answer. Mayo Clinic defines the normal human oxygen level as 95 percent to 100 percent. Levels below 90 percent are considered low. Oxygen levels are usually measured with a pulse oximeter device attached to the finger; this device measures the amount of oxygen saturating the blood. Continue Reading.