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Medical Term:

alveolar-arterial oxygen difference


the difference or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A–a)02. Normally in young adults this value is less than 20 mm Hg.

See Also: alveolar gas equation

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.