| Abbreviation | Definition |
|---|---|
| AS | Acute Stress |
| AS | Adams-Stokes syndrome |
| AS | Alport Syndrome |
| AS | Anal Sphincter |
| AS | Ankylosing Spondylitis |
| AS | Aortic Stenosis |
| AS | ArterioSclerosis |
| AS | AScending aorta |
| AS | Aseptic Meningitis |
| AS | Asperger Syndrome |
| AS | Astigmatism |
| AS | Auris Sinistra (left Ear) |
| ASA | AcetylSalicylic Acid (Aspirin) |
| ASA | ArgininoSuccinic Acidemia |
| ASAS | Australian Scale for Aspergers Syndrome |
| ASC | Altered State of Consciousness |
| ASC | Ambulatory Surgery Center |
| ASC | Anterior Subcapsular |
| ASC | Arteriosclerosis |
| ASC | Ascending |