List of medical abbreviations: U
| Abbreviation | Meaning | 
|---|---|
| UOSM | urine osmolality | 
| UA | urinalysis  unstable angina  | 
| U/A | upon arrival | 
| UAE | Uterine Artery Embolization (synonym for Uterine Fibroid Embolization) | 
| UBT | urea breath test | 
| UC | ulcerative colitis  uterine contraction  | 
| UCHD | usual childhood diseases (see list of childhood diseases) | 
| UCTD | Undifferentiated connective tissue disease | 
| UCx | Urine culture | 
| UD | as directed (from Latin ut dictum) | 
| UDS | urine drug screening  Undifferentiated sarcoma  | 
| UDT | urine drug test  undescended testis  | 
| UE | upper extremity | 
| U&E | urea and electrolytes (blood test) (for sodium and potassium, and often creatinine) | 
| UFE | Uterine Fibroid Embolization | 
| UIP | usual interstitial pneumonitis | 
| UGI | upper gastrointestinal | 
| ULN | upper limit of normal | 
| UMN | upper motor neuron | 
| UNOS | United Network for Organ Sharing | 
| UOP, UO, U/O | urinary output | 
| Ung | ointment (from Latin unguentum) | 
| Unk | unknown | 
| UPJ | ureteropelvic junction (see pyeloplasty) | 
| UPO | until proven otherwise | 
| UPT | urine pregnancy test | 
| URA | unilateral renal agenesis | 
| URI | upper respiratory infection | 
| URS | Ureteroscopy | 
| URTI | upper respiratory tract infection | 
| US | ultrasonogram | 
| USA | unstable angina | 
| USG | ultrasonogram | 
| USO | unilateral salpingo-oophorectomy | 
| USOH | usual state of health | 
| USP | United States Pharmacopeia | 
| USR | unheated serum reagin | 
| USS | ultrasound scan | 
| UTI | urinary tract infection | 
| UUS | upper uterine segment | 
| UVAL | ultraviolet argon laser | 
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