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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 indicates the level of oxygen saturation of the hemoglobin in the blood, referred to as SpO2. The test is usually performed on the index finger, measurements being taken at the capillary level. Results can be used to diagnose poor binding between oxygen and hemoglobin, or other hematological problems.