| Abbreviation | Definition |
|---|---|
| TSS | Therapeutic Staff Support |
| TSTB | Tape Stripping Toluidine Blue |
| TTS | Transdermal Therapeutic System |
| TTS | Tumour Targeted Superantigens |
| TTT | Tibial Tubercle Transfer |
| TURBT | Transurethral Resection of Bladder Tumour |
| TV | Tumor Volume |
| TXT | The Xtermination Team |
| TZB | Tumor Zentrum Berlin |
| U&ES | Urea and Electrolytes |
| U&E's | Urea and Electrolytes |
| UA | UrinAnalysis |
| UAS | Upstream Activator Sequence |
| UICC | Union Internationale Contre le Cancer - International Union Against Cancer |
| UIP | Unconventional Innovations Program |
| UKACR | United Kingdom Association of Cancer Registries |
| UKCCCR | United Kingdom Coordinating Committee for Cancer Research |
| UKCCRG | United Kingdom Children's Cancer Research Group (Oxford) |
| UKCCSG | United Kingdom Children's Cancer Study Group |
| ULN | Upper Limits of Normal |