| Abbreviation | Definition |
|---|---|
| CO2 | Carbon Dioxide |
| COAF | Combination Of Adverse Factors |
| COC | Combined Oral Contraceptive |
| CODEHOP | Consensus degenerate hybrid oligonucleotide primer |
| COEI | COmmon EIder |
| COF | Cup Of Fungus |
| CofA | certificate of analysis |
| COHB | CarboxyHemoglobin test |
| COL | Colonies |
| COMS | Comscollaborative Ocular Melanoma Study |
| COMS | Continuous Opacity Monitoring System |
| COMT | Catechol-O-MethylTransferase |
| CoNS | Coagulase negative Staphilococcus |
| COR | Coronary Observation Radio |
| CORL | Comparative Ophthalmic Research Laboratories |
| CORL | Comparative Orthopaedic Research Laboratory |
| corr | corrected |
| COX | Cyclooxygenase |
| CP | chemically pure |
| CP | Compliance Program |