- banded neutrophils: Bands
- barium: Ba
- barium enema: BE
- basal metabolic rate: BMR
- basophils: Baso
- bathroom privileges: BRP
- beats per minute: bpm
- below the knee amputation: BKA
- benign postural vertigo: BPV
- benign prostatic hypertrophy: BPH
- bilateral: bil
- bilateral salpingo-oophorectomy: BSO
- bilirubin (total and direct): bili (T/D)
- biopsy: Biop or Bx
- bleeding time: BT
- blood pressure: BP
- blood urea nitrogen: BUN
- bone conduction: BC
- bowel movement: BM
- breath sounds; bowel sounds: B.S.
- bright red blood per rectum (hematochezia): BRBPR
- bromsulphalein: BSP
- bronchoscopy: Bronch
- bundle branch block (RBBB- right BBB; LBBB- left BBB): BBB
- twice a day (bis in die): bid