Breaking Free from Your Fetal Chains: A Case-Based Review of the Literature on Gamma Chain Variant Hemoglobinopathies

Methemoglobinemia is a dyshemoglobinemia characterized by cyanosis and reduced oxygen saturation with increased methemoglobin values. The etiology may be congenital or acquired, with the latter being more common. We report a case of a full-term neonate who presented with transient cyanosis and methemoglobinemia caused by a mutation in the gamma chain of fetal hemoglobin.