Some embodiments relate to methods of treating hyperbilirubinemia comprising administrating a therapeutic amount of a metalloporphyrin to an infant. Administration may occur when the infant's measured total serum bilirubin levels are at or below about the level suggested by the AAP nomogram for initiating phototherapy, when the infant's measured total serum bilirubin levels are at about the level suggested for initiating phototherapy in an infant, or when the infant's measured total serum bilirubin levels are at about the level suggested for initiating phototherapy. Administration may occur without regard to the total serum bilirubin level of the infant. In some embodiments, administration of the metalloporphyrin does not cause QT prolongation.
