| Abbreviation |
Term(s) |
| U |
Unit |
| UCHD |
Usual childhood disease |
| UE |
Upper extremity |
| UGI |
Upper gastrointestinal |
| UIQ |
Upper inner quadrant (breast) |
| UMB |
Navel (umbilicus) |
| UNDIFF |
Undifferentiated |
| UOQ |
Upper outer quadrant (abdomen) |
| UR |
Urine |
| URI |
Upper respiratory infection |
| UROL |
Urology |