| Abbreviation | Definition |
|---|---|
| ChLIA | chemi-luminescent immunoassay |
| CHMP | Committee for Medicinal Products for Human Use |
| CHO | carbohydrate |
| CHPA | Consumer Healthcare Products Association |
| CHSB | Chemical Hazards Science Branch |
| CHSB(CFSAN) | Chemical Hazards Science Branch (CFSAN) |
| CI | Clinical Investigator |
| CI/KR | Critical infrastructure and key resources |
| CIA | Corporate Integrity Agreement |
| CIAC | Computer Incident Advisory Capability |
| CIAO | Critical Infrastructure Assurance Office |
| CIB | Clinical Investigator's Brochure |
| CIB(CFSAN) | Compliance Information Branch (CFSAN) |
| CID | Center for Infectious Diseases |
| CIN | Color Index Number |
| CIN | Color Index number (ORA AofC code) |
| CINAHL | Cumulative Index to Nursing and Allied Health Literature |
| CIOMS | Council for International Organizations of Medical Sciences |
| CIP | Clean In Place |
| CIP | Critical Infrastructure Protection |