Snapshot A 2-week-old boy is brought to the emergency department after progressive lethargy over the course of the previous week. His parents report extended episodes of vomiting after feeding ever since birth though this has not previously been extensively investigated. Physical exam shows the development of bilateral cataracts so based on clinical suspicion a metabolic panel is conducted in order to evaluate for disorders of galactose metabolism. Overview Source login to view 3 more bullets Metabolic pathway login to view 6 more bullets Pathophysiology Galactokinase deficiency login to view 8 more bullets Gal-1-P uridyl transferase deficiency login to view 13 more bullets Lactose intolerance login to view 17 more bullets