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HBsAg Carrier Status and the Association Between Gestational Diabetes With Increased Serum Ferritin Concentration in Chinese Women

¹ Department of Obstetrics and Gynaecology, the University of Hong Kong, Hong Kong, China
² Queen Mary Hospital, Hong Kong, China

Address correspondence and reprint requests to Dr. Terence Lao, Department of Obstetrics and Gynaecology, Queen Mary Hospital, 102 Pokfulam Rd., Hong Kong, China. E-mail: laotth{at}hkucc.hku.hk

OBJECTIVE—To determine whether the high prevalence of hepatitis B surface antigen (HBsAg) carriage in our population can explain the previous observation of an association between increased maternal serum ferritin concentration and gestational diabetes in Hong Kong Chinese women.

RESEARCH DESIGN AND METHODS—A retrospective study was performed on 767 nonanemic women with singleton pregnancy who had iron status assessed at 28–30 weeks. The result of the routine antenatal HBsAg screening was retrieved from patient records. The HBsAg-positive and -negative groups were compared for maternal characteristics, prevalence of gestational diabetes in the third trimester, prevalence of high serum ferritin and iron concentrations, and transferrin saturation, which is defined as a value in the highest quartile established by the measurements obtained from the HBsAg-negative group.

RESULTS—The incidences of oral glucose tolerance test and gestational diabetes were significantly increased in the HBsAg-positive group. The HBsAg-positive women with gestational diabetes had significantly increased prevalence of high serum ferritin compared with the HBsAg-negative women, irrespective of the latter’s gestational diabetes status. Multiple logistic regression analysis confirmed the independent association between HBsAg carrier status with gestational diabetes (relative risk 3.51, 95% CI 1.83–6.73) but excluded high ferritin as an independent factor.

CONCLUSIONS—Our results indicate that maternal HBsAg carriage could explain in part the association between increased serum ferritin concentration with gestational diabetes in Hong Kong Chinese women, and that HBsAg carrier status is an independent risk factor for gestational diabetes.

Abbreviations: HBsAg, hepatitis B surface antigen, HBV, hepatitis B virus • HCV, hepatitis C virus • OGTT, oral glucose tolerance test

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