| Abbreviations | Meaning |
 | CM | Congenital Malformation |
| NHS-2 | Second Natural History Study [of Congenital Heart Defects] |
| CONGEN | Congenital |
| CHD | Congenital Hip Dislocation |
| CLAH | Congenital Lipoid Adrenal Hyperplasia |
| CLAS | Congenital Localized Absence Of Skin |
| CROME | Congenital Cataracts-epileptic Fits-mental Retardation [syndrome] |
| CMG | Canine Or Congenital Myasthenia Gravis; Case Mix Group; Chopped Meat Glucose [medium]; Cystometrography, Cystometrogram |
| CDO | Congenital Duodenal Obstruction |
| CPI | Congenital Palatopharyngeal Incompetence |
| NHS-1 | First Natural History Study [of Congenital Heart Defects] |
| CHILD | Congenital Hemidysplasia With Ichthyosiform Erythroderma And Limb Defects [syndrome] |
| CGH | Chorionic Gonadotropic Hormone; Comparative Genome Hybridization; Congenital Generalized Hypertrichosis |
| CRD | Congenital Rubella Deafness |
| COIF | Congenital Onychodysplasia Of The Index Finger |
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