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The arteriovenous oxygen difference, or a-vO 2 diff, is the difference in the oxygen content of the blood between the arterial blood and the venous blood. It is an indication of how much oxygen is removed from the blood in capillaries as the blood circulates in the body.
A pulse oximeter is a medical device that measures levels of blood oxygen saturation, monitors pulse rate and calculates heart rate.It utilizes a non-invasive analysis to measure blood oxygen saturation, so no blood samples need to be drawn.ormal blood oxygen saturation readings at or near sea level is between 95 to 100 percent, as measured by the pulse oximeter. Normal arterial blood flow and calculated heart rate depend on the state and age of the patient (such as newborn or unconscious adult).