 1 50g screen 100g 3h GTT; 2 50g screen 75g 2h GTT; or 3 75g 2h GTT. During the glucose test, study participants will also be asked information on health and costs incurred for the process of glucose testing. If the screen or GTT needs to be repeated at some time during the pregnancy, patients will remain in the same study arm as originally assigned. Interpretation of results by patients caregivers and referral to the diabetes clinic as needed will continue as usual. Data will be analysed using appropriate bivariate and multivariate methods for GDM incidence, direct and indirect costs of glucose testing, and maternal and infant outcomes. 