| Cu | urea clearance |
|---|---|
| UC | ulcerative colitis; ultracentrifugal; umbilical cord; unchanged; unclassifiable; unconscious; undiff... |
| UCL | ulnar collateral ligament; upper collateral ligament; upper confidence limit; upper control limit; u... |
| SUN | standard unit of nomenclature; serum urea nitrogen |
| Cs | standard clearance; static respiratory compliance |