Table 3.

Mathematical models for pCO₂ conversion

Model	Formula
Zeserson model (mm Hg)²³	peCO₂ = pvCO₂ − 4.8
Farkas model (mm Hg)²²	peCO₂ = pvCO₂ − (0.22 × (93 − svO₂))
Lemoël model (mm Hg)²¹	peCO₂ = pvCO₂ − (0.3 × (75 − svO₂))

Abbreviations: pCO₂, partial pressure of CO₂; peCO₂, estimated pCO₂; pvCO₂, venous pCO₂; svO₂, venous functional oxygen saturation.