| Abbreviations | Meaning |
 | CHB | Chronic Hepatitis B; Complete Heart Block; Congenital Heart Block |
| NHS-1 | First Natural History Study [of Congenital Heart Defects] |
| CNHD | Congenital Nonspherocytic Hemolytic Disease |
| VACA | Valvuloplasty And Angioplasty In Congenital Anomalies [registry] |
| CVT | Cardiovascular Technologist; Central Venous Temperature; Cerebral Venous Thrombosis; Congenital Vertical Talus |
| CEP | Congenital Erythropoietic Porphyria |
| CGAB | Congenital Abnormality [UMLS] |
| CLAS | Congenital Localized Absence Of Skin |
| CMK | Chloromethyl Ketone; Congenital Multicystic Kidney |
| CN | Congenital Nystagmus |
| CDA | Congenital Dyserythropoietic Anemia |
| CVAH | Congenital Virilizing Adrenal Hyperplasia |
| CRD | Congenital Rubella Deafness |
| CLD | Congenital Limb Deficiency |
| CAH | Congenital Adrenal Hyperplasia |
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