| TVR | tonic vibratory reflex; total vascular resistance; tricuspid valve replacement |
|---|---|
| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
| VOR | vestibulo-ocular reflex; volume of regret |
| VRR | ventral root reflex |
| VUR | vesicoureteral reflex |