| BU | base of prism up; Bethesda unit; blood urea; Bodansky unit; bromouracil; burn unit |
|---|---|
| CICU | cardiac intensive care unit; cardiovascular inpatient care unit; coronary intensive care unit |
| CSU | casualty staging unit; catheter specimen of urine; central statistical unit; clinical specialty unit... |
| CTU | cardiac-thoracic unit; centigrade thermal unit; constitutive transcription unit |
| ICU | infant care unit; immunologic contact urticaria; intensive care unit; intermediate care unit |