| AAPCC | adjusted annual per capita cost; adjusted average per capita cost; American Association of Poison Control Centers |
|---|---|
| AaPCO2, (A-a)PCO2 | alveolo-arterial carbon dioxide tension difference |
| AAPF | anti-arteriosclerosis polysaccharide factor |
| AAPHD | American Association of Public Health Dentists |
| AAPHP | American Association of Public Health Physicians |
| AAPL | American Academy of Psychiatry and the Law |
| AAPM | American Association of Physicists in Medicine |
| AAPM&R | American Academy of Physical Medicine and Rehabilitation |
| AAPMC | antibiotic-associated pseudomembranous colitis |
| AaPO2, (A-a) PO2 | alveolo-arterial oxygen tension difference |