| TUD | total urethral discharge |
|---|---|
| UC | ulcerative colitis; ultracentrifugal; umbilical cord; unchanged; unclassifiable; unconscious; undiff... |
| 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 |