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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 does oxygen saturation mean? Oxygen saturation refers to the amount of oxygen your child's red blood cells are carrying. If your child is in good health, the majority (95% to 100%) of her red blood cells that have passed through the lungs should be full of, or saturated, with oxygen. If she has a heart condition that prevents the red blood cells (specifically hemoglobin) from picking up oxygen, her saturation level will be lower.