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A pulse oximeter probe applied to a person's finger. A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmogram.ulse oximetry is a non-invasive method for monitoring a person's O 2 saturation.
A pulse oximeter uses two frequencies of. light (red and infrared) to determine the percentage (%) of hemoglobin in the blood that is. saturated with oxygen. The percentage is called blood oxygen saturation, or SpO. 2. A pulse. oximeter also measures and displays the pulse rate at the same time it measures the SpO.