 This study investigated the prevalence and characteristics of glucose-5-phosphate dehydrogenase, G6PD, testing in Korea. It was found that 1.6% of patients had decreased G6PD activity, less than 7.9 U-slash G-HB. Only 7 male patients with G6PD deficiency, less than 30% of the male median, were identified, with ages ranging from 4.8 months to 50.2 years. No female patients with G6PD deficiency were found. Further research is needed to determine the clinical significance of G6PD test results and monitor its use. This article was authored by Rewa Choi, Wonseo Park, Geyong Chun, and others.