A-a Gradient

AAG = (( P_Atm - P_H2O) * FIO2/100 - ( P_CO2 / Resp_Quot )) - P_aO2

Input:

P_Atm
P_H2O
FIO2
P_CO2
Resp_Quot
P_aO2

Result:

AAG
 
Decimal Precision:


A-a Gradient Interpretation

High A-a gradients are associated with oxygen transfer / gas exchange problems. These are usually associated with alveolar membrane or interstitial disease. Hypoxiemia in the face of a normal A-a gradient implies hypoventilation with displacement of alveolar O2 by CO2 or other substance.
 

Hand-Held System Info at MedCalc 3000 Complete Edition


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