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Alveolar-arterial oxygen gradient
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Alveolar-arterial oxygen gradient
Local barometric pressure (P
B
)
(760 mmHg = normal atmospheric pressure at sea level)
mmHg
Partial pressure of arterial O
2
(PaO
2
)
mmHg
Partial pressure of arterial CO
2
(PaCO
2
)
mmHg
Fraction of inspired oxygen (F
i
O
2
)
(0.21 = normal room air, 1.0 = pure oxygen)
0.21
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Results
A-a gradient:
