Mixed Venous Oxygen Saturation

**Semantic type:** Laboratory Procedure

**Definition:** The oxygen content of the venous blood returned to the heart via the superior and inferior vena caval system after perfusing the entire body. The venous blood in the pulmonary artery, measured using a pulmonary artery catheter, represents oxygen extraction from the whole body.

**Synonyms:** - Mixed venous O2 saturation - SmvO2