| Abbreviation | Definition |
|---|---|
| ATS | Anxiety tension state |
| ATS | ArTerioSclerosis |
| ATTN | Aids Therapeutic Treatment Now |
| AU | Auris Utraque (both ears) |
| AUBC | Acute Uncomplicated Bacterial Cystitis |
| AuBF | Auricular Blood Flow |
| AUBM | Autologous Unfractionated Bone Marrow |
| AUBP | Anomalia de la Union BilioPancreatica |
| AUC | American University of the Caribbean |
| AUL | Acute Undifferentiated Leukemia |
| AUM | Autotrophy Utility Margin |
| AUSC | Auscultation |
| AV | Aortic Valve |
| AV | ArterioVenous |
| AV | Atrio-Ventricular |
| AV | Avulsion |
| AVB | Applied Verbal Behavior |
| AVB | Atrioventricular bundle |
| AVC | Apical Vesicle Cluster |
| AVD | Arterial Vascular Disease |