(redirected from alveolar-arterial oxygen tension difference)


The difference or gradient between the partial pressure of oxygen in the alveolar spaces and that in arterial blood. Normally less than 10 mmHg, it is increased with large right-to-left cardiac or vascular shunts.
See: alveolar air equation
Synonym(s): alveolar-arterial oxygen tension difference.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The derived variables included the arterial-alveolar oxygen tension ratio (a/A ratio), alveolar-arterial oxygen tension difference (A-a[O.sub.2]), and respiratory index (RI).
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