What is an A-aO2 difference?

From what I am reading, it is a difference betwenn the partial pressure of oxygen in the alveolar spaces and within the arterial blood.

Exactly what are they talking around here in layman's vocabulary?


Answers:    It is the difference between the Alveolar and aortic oxygen measurements
Its an attempt to determine if oxygen is getting into the blood stream. If there are barrier to the movement of oxygen from the lungs to the bloodstream its an indication of a serious problem. In the past it be used to try and determine if someone has a pulmonary embolism. But also a host of issues where on earth the lungs may be thickened preventing oxygen from getting into the bloodstream.

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