| AAMT | American Association for Medical Transcription |
|---|---|
| AAN | AIDS-associated nephropathy; alpha-amino nitrogen; American Academy of Neurology; American Academy of Nursing; American Academy of Nutrition; American Association of Neuropathologists; amino acid nitrogen; analgesic-associated nephropathy; attending's admission notes |
| AANA | American Association of Nurse Anesthetists |
| AANE | American Association of Nurse Executives |
| AANM | American Association of Nurse-Midwives |
| AANPI | American Association of Nurses Practicing Independently |
| AAO | American Academy of Osteopathy; American Academy of Ophthalmology; American Academy of Optometry; American Academy of Otolaryngology; American Association of Ophthalmologists; American Association of Orthodontists; amino acid oxidase; ascending aorta; awake, alert, and oriented |
| AAo | ascending aorta |
| AAOC | antacid of choice |
| AAofA | Ambulance Association of America |