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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.
What is blood oxygen saturation? Oxygen saturation or dissolved oxygen (DO) is a relative measure of the amount of oxygen that is dissolved or carried in a given medium. It can be measured with a dissolved oxâ¦ygen probe such as an oxygen sensor or an optode in liquid media, usually water. Blood oxygen saturation level refers to the percentage of a person's red blood cells that are loaded or filled with oxygen. Oxygen is carried by the red blood cells to organs, such as the brain and the heart. If the blood oxygen level is too low, not enough oxygen is carried to the organs.