| Classification | Fetal heart diseases |
| Complex | Heterotaxy or atrial isomerism, atresia or severe hypoplasia of a valve or chamber (hypoplastic left heart syndrome, pulmonary atresia, tricuspid atresia, aortic atresia, mitral atresia, and Ebstein’s anomaly), and abnormalities of the valve inlet or outlet (complete atrioventricular septal defect, truncus arteriosus, double inlet left or right ventricle, and double outlet left or right ventricle congenitally corrected transposition of the great arteries) |
| Significant | Transposition of the great vessels, tetralogy of Fallot, large ventricular septal defect, coarctation of the aorta, aortopulmonary window, critical aortic or pulmonary stenosis, partial atrioventricular septal defect, total anomalous pulmonary venous connection, and tricuspid valve dysplasia (no Ebstein’s anomaly) |
| Minor | Small ventricular septal defect and less severe aortic or pulmonary stenosis |
| Others | Dysrhythmias, cardiomyopathies, secondary dextrocardia/levocardia, pulmonary sequestration, and restrictive ductus arteriosus |
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