G6PD and hyperinsulinemic hypoglycemia, familial, 4: The two most common G6PDd variants are the G6PD A- and G6PD Mediterranean variants.4 G6PD A- is common across the African continent and is categorised as a Class III deficiency, whereas G6PD Mediterranean is common among Italians, Arabs, and Jews, and is categorised as a Class II deficiency.4 In Southeast Asia, the most common variant in Myanmar and Thailand is G6PD Mahidol (Class III), whereas in Laos and Cambodia, the most common variant is G6PD Viangchan (Class II).5 6