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Alveolar-Arterial O2Gradient

A-a gradient is the difference in partial pressure of oxygen between arterial and alveolar blood. It can determine if hypoxia is a reflection of hypoventilation or due to deficiency in oxygenation.

 Arterial Oxygen Tension(mmHg)
 Arterial Carbon-Di-Oxide Tension(mmHg)
Results:
O2 Gradient

Interpretation:

A normal A-a gradient is 10-20 mm Hg, with the normal gradient increasing within this range as the patient ages.
  • A normal A-a gradient in the face of hypoxemia suggests the hypoxemia is due to hypoventilation and not due to underlying lung disorders.
  • An increased A-a gradient identifies decreased oxygen in the arterial blood compared to the oxygen in the alveolus. This suggests a process that interferes with gas transfer, or in general terms, suggests ventilation-perfusion mismatch.

Disclaimer

The calculators provided in this section are for information purposes only. They are not meant to be a substitute for professional advise and are not to be used for medical diagnosis. The calculators provide only approximate values of the indices indicated and therefore should not be used for clinical or diagnostic purposes. www.webhealthcentre.com makes no claims whatsoever, expressed or implied, about the authenticity, accuracy, reliability, completeness or timeliness of the material, software, text, graphics and links given in this section. In no event shall www.webhealthcentre.com, its suppliers, affiliates or any third parties be liable in any manner whatsoever for any damages arising upon use of any information given in this section in any manner whatsoever.

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