| AASD | American Academy of Stress Disorders |
|---|---|
| AASH | adrenal androgen stimulating hormone; American Association for the Study of Headache |
| AASK | African American Study of Kidney Diseases and Hypertension Pilot Study |
| AASP | acute atrophic spinal paralysis; American Association of Senior Physicians; ascending aorta synchronized pulsation |
| AASS | American Association for Social Security |
| AAT | Alpha(α)-Anti-Trypsin |
| AAT | Aachen Aphasia Test; academic aptitude test; alanine aminotransferase; alkylating agent therapy; alpha-1-antitrypsin; atrial triggered [pacemaker]; auditory apperception test; automatic atrial tachycardia |
| AATS | American Association for Thoracic Surgery |
| AAU | acute anterior uveitis |
| AAV | adeno-associated virus |