| RU | radioulnar; rat unit; reading unit; residual urine; resin uptake; resistance unit; retrograde urogra... |
|---|---|
| RUR | resin-uptake ratio |
| THUG | thyroid uptake gradient |
| T3RU | triiodothyronine resin uptake |
| TU | thiouracil; thyroid uptake; Todd unit; toxin unit; transmission unit; transurethral; tuberculin unit... |