| Abbreviation | Definition |
|---|---|
| REAL | Real Environment Assessment Laboratory |
| REAL | Regional Economics Applications Laboratory |
| RECT | Rectally |
| REL | Regional Education Laboratories |
| REL | Regional Educational Laboratories |
| REM | Rapid Eye Movement |
| REPPCR | repetitive extragenic palindromic polymerase chain reaction |
| REPT | Repeatable |
| RES | Reticuloendothelial Sysem |
| REV | Review |
| RF | Rheumatoid factor |
| RfD | reference dose |
| RFL | Robotic Fabrication Laboratory |
| RFTS | Request For Test Services |
| RG | Rabies Glycoprotein |
| RGD | Arginine-Glycine-Aspartate |
| RGD | Rubber Glove Dispenser |
| RGM | Rapidly Growing Mycobacteria |
| RH | Releasing Hormone |
| Rh | Rhesus Factor |