Pediatrics General a8c3cb3f Bart's hydrops fetalis is lethal because A Hb Bart's cannot bind oxygen B Hb Bart's cannot release oxygen to fetal tissues C Microcytic red cells become trapped in the placental D The excess a - globin form insoluble precipitates High-Yield Explanation Bart hydrops fetalis is a lethal complication of alpha thalassemia trait where oxygen can't release from hemoglobin