| U&C | urethral and cervical; usual and customary |
|---|---|
| UCI | unusual childhood illness; urethral catheter in; urinary catheter in |
| UCO | ultrasonic cardiac output; urethral catheter out; urinary catheter out |
| UMS | urethral manipulation syndrome |
| UO | under observation; undetermined origin; urethral orifice; urinary output |