| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
|---|---|
| U-AMY | urinary amylase |
| UB | ultimobranchial body; Unna boot; upper back; urinary bladder |
| UC | ulcerative colitis; ultracentrifugal; umbilical cord; unchanged; unclassifiable; unconscious; undiff... |
| UCG | ultrasonic cardiography; urinary chorionic gonadotropin |