| UCI | unusual childhood illness; urethral catheter in; urinary catheter in |
|---|---|
| UCL | ulnar collateral ligament; upper collateral ligament; upper confidence limit; upper control limit; urea clearance |
| UCLP | unilateral cleft of lip and palate |
| UCO | ultrasonic cardiac output; urethral catheter out; urinary catheter out |
| UCOD | underlying cause of death |
| UCP | uncoupling protein; urinary coproporphyrin; urinary C-peptide |
| UCPT | urinary coproporphyrin test |
| UCR | unconditioned response; usual, customary, and reasonable [fees] |
| UCS | unconditioned stimulus; unconscious; uterine compression syndrome |
| ucs | unconscious |