In the neonatal period, a red cell deficiency of glucose-6-phosphate dehydrogenase (G-6-PD) may result in jaundice, the severity of which will vary between patients. Diagnosis of this inborn error of metabolism presents a problem if there is a large number of young enzyme-rich red cells in circulation, and this paper details the technique used to confirm a red cell deficiency of G-6-PD in a neonate.
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