The venous pO2 is easy. As you would expect, venous blood has much less oxygen than arterial blood. Normal arterial pO2 (pAO2) is about 80-100 mm; the corresponding oxygen saturation is anything greater than 95% saturation. Venous pO2 is normally 40 mm Hg. This is the same as the normal arterial pCO2, making it easy to remember.
The venous pCO2 is also pretty easy. The venous pCO2 is 5.7 mm Hg higher than arterial. For practical purposes, call it 6 mm Hg. Normal arterial pCO2 is 40 (same as the venous pO2 remember?), so normal venous pCO2 is
The venous pCO2 is also pretty easy. The venous pCO2 is 5.7 mm Hg higher than arterial. For practical purposes, call it 6 mm Hg. Normal arterial pCO2 is 40 (same as the venous pO2 remember?), so normal venous pCO2 is