| UB | ultimobranchial body; Unna boot; upper back; urinary bladder |
|---|---|
| UB 82 | universal billing document [1982] |
| UBA | undenaturated bacterial antigen |
| UBB | ubiquitin B |
| UBBC | unsaturated vitamin B12 binding capacity |
| UBC | ubuquitin C; University of British Columbia [brace] |
| UBE | ubiquitin-activating enzyme |
| UBF | uterine blood flow |
| UBG, Ubg | urobilinogen |
| UBI | ultraviolet blood irradiation |