| UCI | unusual childhood illness; urethral catheter in; urinary catheter in |
|---|---|
| UCO | ultrasonic cardiac output; urethral catheter out; urinary catheter out |
| UCPT | urinary coproporphyrin test |
| UF | film unsharpness; ultrafiltrate; ultrafiltration; ultrafine; ultrasonic frequency; universal feeder;... |
| UFB | urinary fat bodies |