| BHU | basic health unit |
|---|---|
| BIU | barrier isolation unit |
| BL | Barre-Lieou [syndrome]; basal lamina; baseline; Bessey-Lowry [unit]; black light; bladder; bleeding;... |
| BLB | Baker-Lima-Baker [mask]; Bessey-Lowry-Brock [method or unit]; black light bulb; Boothby-Lovelace-Bul... |
| BLU | Bessey-Lowry unit |