| Abbreviation | Definition |
|---|---|
| CK | Chee Kang |
| Ck | chicken |
| CK | Clinical Knowledge |
| CK | Creatine Kinase |
| CK | Cyanogen Chloride (Cyanide gas) |
| CKI | Creatinine Kinase Isoenzyme |
| CKI | cyclin-dependent kinase inhibitor |
| CK-MB | Creatinine Kinase-Myocardial Band |
| CL | Chloride |
| CL | Common List |
| CLA | Classroom Laboratory Administration |
| CLAAC | Campus Laboratory Animal Acquisitions Coordinator (UCSD) |
| CLAAC | Complex Laboratory for Analysis of Aromatic Carbohydrates |
| CLAIRE | Confederation of Laboratories for Artificial Intelligence Research in Europe |
| CLAR | Central Laboratory for Aquaculture Research |
| CLB | Classroom Laboratory Building |
| CLCS | Core Laboratory For Clinical Studies |
| CLEB | Committee for Laboratory and Environmental Biosafety |
| CLED | Cystine, Lactose, Electrolyte-Deficient |
| CLEP | Clinical Laboratory Evaluation Program |