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Though the pulse oximeter actually measures the saturation of oxygen in your blood, the results are often used as an estimate of blood oxygen levels. Normal pulse oximeter readings range from 95 to 100 percent, under most circumstances. Values under 90 percent are considered low. 1  Causes.
What are the symptoms of low oxygen? Symptoms of low oxygen levels in the blood include rapid breathing, fast heart rate, confusion, shortness of breath and changes in the skin color, which can range from blue to cherry red, according to WebMD. Body tissues require a certain amount of oxygen for the body to function properly, notes Mayo Clinic.