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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 is a medical device that indirectly measures levels of hypoxia. The device senses levels of oxygen saturation in arterial blood using spectral analysis, along with pulse rate. Generally, oximeters are accurate in measuring oxygen saturation between 70 and 100 percent.