A patient's pO2 varies with age. pCO2 is affected by altitude, with values for pCO2 decreasing with altitude above sea level at a rate of 5 mm Hg per mile above sea level.
Equations for pO2 and Age
pO2 in mm Hg =
Author
(-0.22 * (age in years)) + 102.5
Conway et al
(-0.24 * (age in years)) + 103.7
Raine and Bishop
(-0.25 * (age in years)) + 104.0
Marshall and Millar
(-0.27 * (age in years)) + 104.2
Mellemgaard
(-0.43 * (age in years)) + 109.0
Sorbini et al
pCO2 and Altitude
pCO2 in mm Hg at given altitude =
= (pCO2 at current altitude in feet) - (5 * ((given altitude in feet) - (current altitude in feet)) / 5280)
where:
• altitude is in feet above sea level
• 5280 indicates the number of feet in a mile
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