| AaPO2, (A-a) PO2 | alveolo-arterial oxygen tension difference |
|---|---|
| AJDO2 | arteriojugular venous oxygen content difference |
| AOD | Academy of Operative Dentistry; Academy of Oral Dynamics; adult onset diabetes; anesthesiologist-on-... |
| AVDO2 | arteriovenous oxygen saturation difference |
| AVDO2B | arteriovenous oxygen saturation difference, basal |