| PIT | pacing-induced tachycardia; patella inhibition test; picture identification test; pitocin; pitressin... |
|---|---|
| RFFIT | rapid fluorescent focus inhibition test |
| RGI | recovery from growth inhibition |
| RIT | radioimmune trypsin; radioiodinated triolein; radioiodine treatment; rosette inhibition titer |
| RTI | respiratory tract infection; reverse transcriptase inhibition |