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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.
Oxygen levels are best measured via an arterial blood gas test that also measures carbon dioxide and pH or, less precisely, with an oximeter, a device that clips on the end of a finger and shines a light through it. The color of the light coming out the other side is analyzed by a tiny computer in the device to determine your blood oxygen level.