| BaS | barium swallow |
|---|---|
| bas | basilar; basophil, basophilic |
| BASA | Boston Assessment of Severe Aphasia |
| BASE | B27-arthritis-sacroiliitis-extra-articular features [syndrome] |
| BASH | body acceleration synchronous with heart rate |
| BASIC | Beginner's All-Purpose Symbolic Introduction Code |
| baso | basophil |
| BAT | basic aid training; best available technology; blunt abdominal trauma; brown adipose tissue |
| BATOs | Boronic Adducts of Technetium Oxine |
| BAUP | Bovie-assisted uvulopalatoplasty |