| UAU | uterine activity unit |
|---|---|
| UBF | uterine blood flow |
| UC | ulcerative colitis; ultracentrifugal; umbilical cord; unchanged; unclassifiable; unconscious; undiff... |
| UCS | unconditioned stimulus; unconscious; uterine compression syndrome |
| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |