| UO | under observation; undetermined origin; urethral orifice; urinary output |
|---|---|
| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |
| EGBUS | external genitalia, Bartholin, urethral, Skene glands |
| EUM | external urethral meatus |
| EUS | endoscopic ultrasound; external urethral sphincter |