Congenital dyserythropoietic anemia type IV (CDA IV) is a newly discovered form of CDA (see this term) characterized by ineffective erythropoiesis and hemolysis that leads to severe anemia at birth. The disease is Congenital dyserythropoietic anemia type IV (Orphanet_293825). Also known as: CDA IV, CDA due to KLF1 mutation, CDA type 4, CDA type IV, CDAN4, Congenital dyserythropoietic anemia due to KLF1 mutation, Congenital dyserythropoietic anemia type 4.