CONTENTS Physiology Epidemiology Clinical presentation Diagnosis Treatment Treatment for most patients Rx in the G6PD deficient patient Podcast Questions & discussion Pitfalls PDF of this chapter (or create customized PDF) normal oxyhemoglobin equilibrium Oxygen binds to HbFe2+ (ferrous) state. During oxygen transport, this transiently forms the HbFe3+ (ferric) state. The ferrous (HbFe2+) form of iron is needed … Continue reading Methemoglobinemia