| PCU | pain control unit; primary care unit; patient care unit; pulmonary care unit |
|---|---|
| RU | radioulnar; rat unit; reading unit; residual urine; resin uptake; resistance unit; retrograde urogra... |
| SU | salicyluric acid; secretory unit; sensation unit; solar urticaria; sorbent unit; spectrophotometric ... |
| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |