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Quick Answer. Mayo Clinic defines the normal human oxygen level as 95 percent to 100 percent. Levels below 90 percent are considered low. Oxygen levels are usually measured with a pulse oximeter device attached to the finger; this device measures the amount of oxygen saturating the blood. Continue Reading.
Blood oxygen level is an important medical tool used to determine how effectively you are taking oxygen into your body. If you're in good health, normal blood oxygen levels almost always fall within a very predictable range.Medical professionals use two primary measurements for determining your blood oxygen level: oxygen saturation and arterial oxygen. The normal values differ for these measurements.lood oxygen level is an important medical tool used to determine how effectively you are taking oxygen into your body. If you're in good health, normal blood oxygen levels almost always fall within a very predictable range.