G6PD and thalassemia: Among the 25 male samples with G6PD deficiency, the MCV and MCH values of G6PD Viangchan 871G>A (69.6±7.0 and 21.0±2.4) were significantly lower than those of G6PD Mahidol 487G>A (90.1±9.0 and 29.4±3.7) and G6PD Canton 1376G>T (93.8±13.5 and 29.5±3.3) (all respectively) because patients with G6PD Viangchan co-inherited with thalassemia disease.