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No matches found.
A-a O
2
Gradient
Assesses for degree of shunting and V/Q mismatch.
System of Measurement
US Customary
Metric (SI)
Atmospheric Pressure
(mm Hg)
(kPa)
760 mm Hg / 101.33 kPa, sea level
PaO
2
(mm Hg)
(kPa)
FIO
2
(room air: 21%)
(%)
(%)
PaCO
2
(mm Hg)
(kPa)
Age (for expected A-a gradient)
(years)
(years)
Interpretation
Source: Helmholz HF Jr. The abbreviated alveolar air equation.
Chest
. 1979 Jun;75(6):748
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