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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.
(This is the most commonly asked question) Oxygen levels are commonly measured by two techniques. The first is a blood gas in which a blood sample is taken directly from an artery. This is the most accurate assessment of oxygen. The normal oxygen level using this technique is 80-100 (mmHg). The second technique is bloodless and is called pulse oximetry. The result here is not a direct measurement of oxygen but rather represents the percentage of hemoglobin that is saturated with oxygen.