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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.
What is pulse oximetry? Pulse oximetry is a noninvasive method that enables the measurement of a personâs blood oxygen saturation, which is often referred to as SpO2 or âThe Fifth Vital Signâ (the first 4 being your pulse, temperature, blood pressure and respiratory rate).he ratio of red to infrared light that goes through the Pulse Ox âs photo diode indicates the percentage of oxygenated versus deoxygenated hemoglobin that your blood contains. This blood oxygen saturation is also called SpO2.