AIMS:Gestational diabetes (GDM) and Type 2 diabetes pose tremendous health and economic burdens as worldwide incidence increases. Primary care-based systematic diabetes screening and prevention programs could be effective in women with previous GDM. GooD4Mum aimed to determine whether a Quality Improvement Collaborative (QIC) would improve postpartum diabetes screening and prevention planning in women with previous GDM in general practice. METHODS:Fifteen general practices within Victoria (Australia) participated in a 12-month QIC, consisting of baseline and four quarterly audits, guideline-led workshops and Plan-Do-Study-Act feedback cycles after each audit. The primary outcome measures were the proportion of women on local GDM registers completing a diabetes screening test and a diabetes prevention planning consultation within the previous 15 months. RESULTS:Diabetes screening increased with rates more than doubled from 26% to 61% and postpartum screening increased from 43%-60%. Diabetes prevention planning consultations did not show the same level of increase (0%-10%). The recording of body mass index improved overall (51%-69%) but the number of women with normal body mass index did not. CONCLUSIONS:GooD4Mum supported increased diabetes screening and the monitoring of high risk women with previous GDM in general practice.