| AAP | air at atmospheric pressure; American Academy of Pediatrics; American Academy of Pedodontics; American Academy of Periodontology; American Academy of Psychoanalysts; American Academy of Psychotherapists; American Association of Pathologists; Association for the Advancement of Psychoanalysis; Association for the Advancement of Psychotherapy; Association of Academic Physiatrists; Association of American Physicians |
|---|---|
| AAPA | American Academy of Physician Assistants; American Association of Pathologist Assistants |
| AAPB | American Association of Pathologists and Bacteriologists |
| AAPC | antibiotic-associated pseudomembranous colitis |
| 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 |