A threefold increase in gestational diabetes over two years: review of screening practices and pregnancy outcomes in Indigenous women of Cape York, Australia

Background: Australian Aboriginal women have a high prevalence of type 2 diabetes (T2DM) in pregnancy and gestational diabetes (GDM). Aims: To review how screening practice affects the pregnancy data of all Indigenous women and their newborns living in Cape York, Queensland. Methods: All medical charts of mothers and their neonates delivered in the regional hospital over two-one-year periods (2006 and 2008) were reviewed. Universal testing with an oral glucose tolerance test (OGTT) was introduced in 2007. Results: Gestational diabetes (GDM) increased from 4.7 to 14.2%, and T2DM was similar (2.4 and 2.3%). There were 127 deliveries in 2006 and 134 in 2008. Testing rates with OGTT improved from 31.4% in 2006 to 65.6% in 2008. Mothers with diabetes in pregnancy (DIP) were older and heavier than non-DIP mothers. Caesarean section rates were significantly higher in the DIP group compared with the non-DIP group (66 vs 25%) in both time periods. The booking weight of DIP mothers decreased 16 kg, their babies normalised their weight, length and head circumference; respiratory distress and Apgar scores improved comparing the two periods. In DIP, infants >40% had hypoglycaemia; however, rates of serious complications were low. Rates of breastfeeding were similar between groups. Follow-up rates for GDM improved from 16.6% in 2006 to 31.6% in 2008. Of those tested one-third were diagnosed with T2DM. Conclusion: The rate of GDM tripled after implementation of universal testing. Outcomes improved. There is still need for improvement in testing and follow-up practices in relation to DIP.