| UI | Ulcer Index |
|---|---|
| UI | Unsaturation index |
| UI | Urinary incontinence |
| UI | Urinary iodone |
| UI | Urotensin I |
| UIBC | unsaturated iron binding capacity |
| UICC | Union International Contre le Cancer |
| UIE | Urinary iodine excretion |
| UIHC | University of Iowa Hospital and Clinics |
| UIP | Usual interstitial pneumonia |