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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.
Preparing to Use a Pulse Oximeter. 1  1. Understand the relationship between oxygen and the blood. Oxygen is breathed into the lungs. 2  2. Understand the reasons for the procedure. Pulse oximetry is used to assess oxygen saturation in the blood for a variety of reasons. 3  3. Understand how the pulse oximeter works.