| Abbreviations | Meaning |
 | CCHD | Caephilly Collaborative Heart Disease [study]; Cyanotic Congenital Heart Disease |
 | CPL | Caprine Placental Lactogen; Conditioned Pitch Level; Congenital Pulmonary Lymphangiectasia |
 | CRD | Congenital Rubella Deafness |
 | CMH | Cardiomyopathy, Hypertrophic; Community Mental Health [services Or Program]; Congenital Malformation Of The Heart |
 | CDG | Congenital Disorders Of Glycosylation |
 | CNS | Congenital Nephrotic Syndrome |
 | U | Congenital Limb Absence |
 | CHHS | Congenital Hypothalamic Hamartoma Syndrome |
 | ACED | Anhidrotic Congenital Ectodermal Dysplasia |
 | CONGHD | Congenital Heart Disease |
 | CHF | Congenital Hepatic Fibrosis |
 | CDO | Congenital Duodenal Obstruction |
 | NHS-2 | Second Natural History Study [of Congenital Heart Defects] |
 | CPSC | Congenital Paucity Of Secondary Synaptic Clefts [syndrome]; Consumer Products Safety Commission |
 | CDH | Ceramide Dihexoside; Congenital Diaphragmatic Hernia; Congenital Dislocation Of Hip; Congenital Dysplasia Of Hip |