*The SOFA criteria are basically the same as the main organ dysfunction symptoms in the old definition of severe sepsis.
SOFA Criteria. This is an image showing the 6 elements of SOFA and how to calculate it.
A SOFA score of ≥ 2 with suspected infection indicates sepsis.
Laboratory variables, namely, Pao2, platelet count, creatinine level, and bilirubin level, are needed for full computation of the SOFA score.
JAMA Article announcing the new sepsis definition, Sepsis 3.
In SOFA, the respiratory function is assessed using PaO2 / FiO2, unlike in qSOFA where a respiratory rate is used.
How to calculate FiO2.
Note that PaO2 comes from an arterial blood gas (ABG).
Reference