Online Clinical Calculators: A-a Gradient
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PaC0
2
mm Hg
Pa0
2
mm Hg
Alveolar O
2
Content
P
A
0
2
=
mm Hg
A-a Gradient
AaD0
2
=
mm Hg
AaD0
2
= P
A
0
2
- Pa0
2
P
A
0
2
= (150 - (PaC0
2
)(1.25))
(assuming FI0
2
= room air)
A-a gradient is the difference in partial pressure of oxygen between arterial and alveolar blood.
Normal value is 5-25 mm Hg or (Age+10) / 4
Online Clinical Calculators: A-a Gradient
Online Clinical Calculators: A-a Gradient