| CAE | Capillary Array Electrophoresis | - | Medical |
| CASSS | California Separation Science Society | - | Medical |
| CATCMB | Center For Advanced Training In Cell And Molecular Biology | - | Medical |
| CATCMB/CUA | Center For Advanced Training In Cell And Molecular Biology/Catholic Univ. Of America | - | Medical |
| CCD | Charged Coupled Device | - | Medical |
| CCM | Chromosome Coordinating Meeting | - | Medical |
| CDC | Centers For Disease Control | - | Medical |
| CDNA | Complementary DNA | - | Medical |
| CE | Capillary Electrophoresis | - | Medical |
| CEPH | Centre D'Etude Du Polymorphisme Humain | - | Medical |
| CF | Cystic Fibrosis | - | Medical |
| CFF | Cystic Fibrosis Foundation | - | Medical |
| CHH | Cartilage-hair Hypoplasia | - | Medical |
| CHI | Cambridge Healthtech Inst. | - | Medical |
| CHOP | Children's Hospital Of Philadelphia | - | Medical |
| CIMB | Center For International Meeting On Biology | - | Medical |
| CIOMS | Council For International Organizations Of Medical Sciences | - | Medical |
| CIRB | Colorado Institute For Research In Biotechnology | - | Medical |
| CLMA | Clinical Laboratory Management Association | - | Medical |
| CM | Centimorgan | - | Medical |
| CMT | Charcot-Marie-Tooth | - | Medical |
| CONTIG | Consortium Of Teachers In Genetics | - | Medical |
| CORN | Council Of Regional Networks For Genetic Services | - | Medical |
| CRADA | Cooperative Research And Development Agreement | - | Medical |
| CSHL | Cold Spring Harbor Laboratory | - | Medical |
| CTG | Trinucleotide Repeat | - | Medical |
| COVID-19 | Coronavirus Disease 2019 | - | Medical |
