| RUA | reduced under anesthesia |
|---|---|
| UE | uncertain etiology; under elbow; uninvolved epidermis; upper esophagus; upper extremity |
| UO | under observation; undetermined origin; urethral orifice; urinary output |
| u/o | under observation |
| ACOP | American College of Osteopathic Pediatricians; approved code of practice |