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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.
Oxygen Saturation. Normally, as PaO2 rises, SaO2, or oxygen saturation, will rise as well. Oxygen saturation of arterial blood has a normal range of 94%-100%. What this means is that normally 94%-100% of oxygen binding sites (which are located on hemoglobin) are saturated with oxygen. Note how that neither PaO2 nor oxygen saturation tell you how much total oxygen is in the blood. Another way to view oxygen saturation is to think about how sponges work.