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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.
Pulse oximetry is a useful tool for assessing oxygen saturation, but it doesn't provide a complete picture of your patient's respiratory status. Understanding what pulse oximetry can and can't do will help you to use this technology wisely.f the pulse oximeter reading is below 70%, you really won't know what the true saturation is without an ABG. Recent advances in pulse oximetry technology, such as signal extraction technology (SET) pulse oximetry, can significantly reduce inaccuracies resulting from motion artifact or low perfusion.