| AaPCO2, (A-a)PCO2 | alveolo-arterial carbon dioxide tension difference |
|---|---|
| AaPO2, (A-a) PO2 | alveolo-arterial oxygen tension difference |
| AID | acquired immunodeficiency disease; acute infectious disease; acute ionization detector; Agency for I... |
| AJDL | arteriojugular venous lactate content difference |
| AJDO2 | arteriojugular venous oxygen content difference |