.O saturation ( SO) 指Hb结合氧的百分数 Amount of oxygen actually combined with Hb, expressed as a percentage of oxygen capacity. CO2-O, of physical solution 100% cO max Normal: Sa02% SvO2 75% Influenced by the Po24. O2 saturation （ SO2 ） Normal： SaO2 95% SvO2 75% Influenced by the PO2 指Hb结合氧的百分数 Amount of oxygen actually combined with Hb, expressed as a percentage of oxygen capacity. CO2 – O2 of physical solution CO2 max = 100%