Glucose-6-phosphate dehydrogenase deficiency and type 2 diabetes.

Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common X-linked human enzyme defect (1). There are a few reports that link G6PD deficiency to diabetes (2–4).

We undertook a cross-sectional study at Maccabi Healthcare Services, an Israeli HMO serving two million members. All interactions and information are captured on an electronic medical record. Our study population included all male members aged ≥25 years who were tested for G6PD between 2003 and 2010 and were found positive (a quantitative G6PD <7 U/g Hb). The testing was undertaken on a Trinity Olympus 2700 in the same central laboratory. All results from 2003 to 2010 were included. Patients with diabetes were drawn from our validated computerized registries (5). Our analysis was of the whole male Maccabi population stratified by age-group, presence in the diabetes register (yes/no), and G6PD deficiency (yes/no). The data were statistically analyzed by a standard statistical package (SPSS 15.0, Chicago, IL).

Among 940,085 individuals, 52,371 had G6PD deficiency. We found a significantly higher proportion of patients with G6PD deficiency among the diabetic population aged 45–64 years (P = 0.002; odds ratio 1.44 [95% CI: 1.145–1.815]) than would be expected by chance. We did not find a significant difference in HbA1c levels between the groups with and without G6PD deficiency.

These results showed a significantly increased association between prevalence of diabetes in the 45–65-year-old age-group among patients with G6PD deficiency when compared with the general population. This association may in fact be an underestimate in view of the fact that many individuals with G6PD deficiency in the general population have not undergone G6PD testing in our HMO or will have undergone testing before 2003 and therefore will have been misclassified. This study provides further evidence of a link between G6PD deficiency and diabetes.