Q. A 2-year-old boy is brought to the ER by his parents. They report that he has developed yellowing of his eyes and he has been less active and more sluggish for the past few days. On clinical examination, you appreciate some abdominal distention and suspect there is splenomegaly. Indeed, his conjuctiva are yellow. Laboratory testing is shown below. An erythrocyte osmotic fragility test is positive. You come to a conclusion on the diagnosis of the patient. What do you inform the patient's parents is the definitive treatment for this patient?