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Determining the level of venous oxygen saturation simultaneously with the saturation of the arterial blood with oxygen allows you to control the oxygen delivery in peripheral tissues of the body. We studied the change in the magnitude of venous blood oxygen saturation during laser-stimulated photodissociation of oxyhemoglobin. It is shown that only strong changes in the saturation of arterial blood with oxygen lead to a change in the level of venous oxygen saturation. The original optical technique for measurement of venous and arterial blood saturation based on the pulse oximetry is presented. [ABSTRACT FROM AUTHOR]