| Abbreviation | Definition |
|---|---|
| CRIS | Clinical Research Information System |
| CRIT | hematoCRIT |
| CRKP | carbapenem-resistant Klebsiella pneumoniae |
| CRL | Cambridge Research Laboratories |
| CRL | Cell Respoistory Line |
| CRL | Charles River Laboratories |
| CRL | Clinical Reference Laboratory |
| CRL | Clinical Research Laboratories |
| CRL | Community Reference Laboratory |
| CRL | Computational Radiology Laboratory |
| CRL | Creative Research Laboratory |
| CRLJ | Charles River Laboratories Japan |
| CRLJ | Communications Research Laboratory Journal |
| CRN | Clinical Research Network |
| CRO | Clinical Research Organization |
| CRS | Clinical Research and Statistics |
| CRST | Clinical Research Site Training |
| CRTC | Clinical Research Training Center |
| CRWL | California Rangeland Watershed Laboratory |
| CS | Control Systems |