AA (affected area)

AA (acute appendicitis)

AA (Alcoholics Anonymous)

AA (alopecia areata)

AA (acetic acid)

AA&O (awake, alert and oriented)

AAA (abdominal aortic aneurysm)

AAFP (American Academy of Family Physicians)

AAL (anterior axillary line)

AAMC (Association of American Medical Colleges)