G6PD is the abbreviation for glucose-6-phosphate dehydrogenase, and hereditary glucose-6-phosphate dehydrogenase deficiency (commonly known as Serpentine disease) is the most common type of inherited enzyme deficiency disease. G6PD normal values: 6.8-20.5u/gHb in adults, 11.8-30/gHb in newborns. significant deficiency 1.6u/gHb in adults, less than 6.6u/gHb in newborns. intermediate values: 1.7-6.7u/gHb in adults, 6.7-11.7u/gHb in newborns.