Alveolar-Arterial Oxygen Gradient Calculator
Alveolar-Arterial Oxygen Gradient: a planned Super Calculator tool. Covers FiO2. Stub page: the tool, its formula and a worked example are not published yet.
Alveolar-Arterial Oxygen Gradient Calculator is a planned calculator in the health section of Super Calculator, covering clinical dosing and scores.
What this calculator will compute
Inputs: FiO2, PaO2, PaCO2, age and altitude or barometric pressure.
Outputs: alveolar oxygen, A-a gradient, age-adjusted expected gradient and PaO2/FiO2 ratio.
Formula, recorded as scope and not yet verified against a primary source: Alveolar oxygen PAO2 = FiO2 * (atmospheric pressure - water vapor pressure) - PaCO2 / respiratory quotient, conventionally FiO2*(760-47) - PaCO2/0.8 at sea level, with the A-a gradient = PAO2 - PaO2 and an age-expected gradient of roughly (age/4) + 4.
Status
This page is a stub. The calculator is not built, no figure on this page has been verified against the authority that sets it, and nothing here should be used to make a decision. The page exists so that the site structure is complete and so that articles can link this concept on first mention.
The stub carries noindex, nofollow and is excluded from the sitemap.