| Abbreviation | Definition |
|---|---|
| BAR | Body Alarm Reaction |
| BAR | Bright, Alert, and Responsive |
| BAS | Back Arm Squeeze |
| BAS | Basal |
| BAS | Basophils |
| BASO | Basophil |
| BAT | Blitz Action Trauma |
| BAT | Brain Attack Team |
| BAT | Brightness Acuity Test |
| BAT | Bulimic Anorexic Trauma |
| BATD | Behavioral Activation Treatment for Depression |
| BAV | Balloon Aortic Valvuloplasty |
| BAV | Bicuspid Aortic Valve |
| BAV-3 | BAnna Virus 3 |
| BAVD | Bicuspid Aortic Valve Disease |
| BAVM | Brain ArterioVenous Malformation |
| BAVR | Biological Aortic Valve Replacement |
| BAVS | Basilar Artery VasoSpasm |
| BAVX | Bal-A-Vis-X |
| BB | Beta Blocker |