A-a gradient


This is another classic formula.

(PAO2 - PaO2)

PAO2 = ( 760 - 47 ) x FiO2 - PaCO2 /0.8 (or 1)

Normal A-a gradient is 20 in a health young person.



a/A Ratio

(PaO2 /PAO2)


PaO2 / FiO2 Ratio or "P/F" Ratio


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