Mixed-venous oxygen saturations

Parameter	SvO₂	ScvO₂
Source	Proximal pulmonary artery	SVC
Composition	Mixture of both IVC and SVC blood	Primarily measures blood from the upper half of the body
Oxygen value	Typically lower (2 to 5%) than ScvO₂	Typically higher than SvO₂

IVC: inferior vena cava; SVC: superior vena cava.

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