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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.
For a normal adult male the oxygen content of arterial blood can be calculated: Given arterial oxygen saturation (SpO2) = 100%, Hb = 15 g/100 ml and arterial partial pressure of oxygen (PaO2) = 13.3 kPa, then the oxygen content of arterial blood (CaO2) is: CaO2 = 20.1 +0.3 = 20.4 ml/100 ml.Similarly the oxygen content of mixed venous blood can be calculated.or a normal adult male the oxygen content of arterial blood can be calculated: Given arterial oxygen saturation (SpO2) = 100%, Hb = 15 g/100 ml and arterial partial pressure of oxygen (PaO2) = 13.3 kPa, then the oxygen content of arterial blood (CaO2) is: CaO2 = 20.1 +0.3 = 20.4 ml/100 ml.