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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.
Results. According to the Mayo Clinic, the blood oxygen level test should show at least a 95 percent level. Levels between 80 percent and 94 percent are considered low but anything lower is a sign of hypoxemia.