Is tetralogy of fallot a hereditary problem?

Not typically.: Most cases are isolated and sporadic. It accounts for 5-10% of all congenital heart defects. 15% of tof cases are part of known genetic syndromes (down, digeorge, alagille, phenylketonuria) or associations (charge/vacterl) and some are linked to poorly controlled preconceptional maternal diabetes mellitus. Recurrence risk: 2.5% with one prior affected child, 8% with two. Folic acid may prevent it!