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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.
Arterial-Venous Oxygen Content Difference. The arterial-venous oxygen content difference is the total oxygen content of arterial blood minus the oxygen content of mixed venous blood. o This value is useful because oxygen changes in mixed venous blood can occur earlier than changes in an arterial blood gas.rterial-Venous Oxygen Content Difference. The arterial-venous oxygen content difference is the total oxygen content of arterial blood minus the oxygen content of mixed venous blood. o This value is useful because oxygen changes in mixed venous blood can occur earlier than changes in an arterial blood gas.