[CK] mixed venous saturation.

Normal values of mixed venous oxygen saturation (SvO2) are 60 - 80%. Central venous oxygen saturation (ScvO2) values represent regional venous saturations with a normal value of ~70%. ScvO2 usually measures slightly higher than SvO2 as it has not mixed with the venous blood from the coronary sinus.

SVO2: >60%(60-80) with coronary sinus 

ScvO2(Internal jugular, or subclavian without coronary sinus = venous blood from heart => lowered than general average): 70%