<unk>  is a benign condition in which significant<unk>  hemoglobin (hemoglobin F) production continues well into adulthood, disregarding the normal shutoff point after which only adult-type hemoglobin should be produced.
Hereditary persistence of fetal hemoglobin
Paroxysmal nocturnal hemoglobinuria
Paroxysmal cold hemoglobinuria
Fetomaternal alloimmune thrombocytopenia
Neonatal alloimmune thrombocytopenia
Congenital hemolytic anemia
Hemoglobin Lepore syndrome
Pure red cell aplasia