| ACU | acquired cold urticaria; acute care unit; agar colony-forming unit; ambulatory care unit |
|---|---|
| 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 |