| (A-a)DN2 | alveolo-arterial nitrogen tension difference |
|---|---|
| AaPCO2, (A-a)PCO2 | alveolo-arterial carbon dioxide tension difference |
| AID | acquired immunodeficiency disease; acute infectious disease; acute ionization detector; Agency for I... |
| AJDL | arteriojugular venous lactate content difference |
| BND | barely noticeable difference |