MVOS (MIXED VENOUS OXYGEN SATURATION)

MIXED VENOUS OXYGEN SATURATION

The percentage saturation of oxygen returning to the heart from the body is a measure of the oxygen delivery and extraction by the tissues. 

Accurate measurement is via analy­sis of blood drawn from a long central line placed in the right atrium. 

Estimations can be made from blood drawn from lines in the superior vena cava, but these values will be slightly higher than those of a mixed venous sample (as there is rela­ tively more oxygen extraction from the lower half of the body). 

Normal mixed venous oxygen saturation levels are 50–70%. 

Levels below 50% indicate inadequate oxygen delivery and increased oxygen extraction by the cells. This is consistent with hypovolaemic or cardiogenic shock.


High mixed venous saturations (>70%) are seen in sepsis and some other forms of distributive shock.

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