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Aims/hypothesis Elevated anti-angiogenic factors such as soluble fms-like tyrosine kinase 1 (sFlt1), a soluble form of vascular endothelial growth factor receptor, and endoglin, a co-receptor for TGFβ1, confer high risk of pre-eclampsia in healthy pregnant women. In this multicentre prospective study, we determined levels of these and related factors in pregnant women with type 1 diabetes, a condition associated with a fourfold increase in pre-eclampsia. Methods Maternal serum sFlt1, endoglin, placental growth factor (PlGF) and pigment epithelial-derived factor were measured in 151 type 1 diabetic and 24 healthy non-diabetic women at each trimester and at term. Diabetologia (2009) Results Approximately 22% of the diabetic women developed pre-eclampsia, primarily after their third trimester visit. In women with pre-eclampsia (diabetic pre-eclampsia, n=26) vs those without hypertensive complications (diabetic normotensive, n=95), significant changes in angiogenic factors were observed, predominantly in the early third trimester and prior to clinical manifestation of pre-eclampsia. Serum sFlt1 levels were increased approximately twofold in type 1 diabetic pre-eclampsia vs type 1 diabetic normotensive women at the third trimester visit (p<0.05) and the normal rise of PlGF during pregnancy was blunted (p<0.05). Among type 1 diabetic women, third trimester sFlt1 and PlGF were inversely related (r 2 =42%, p<0.0001). Endoglin levels were increased significantly in the diabetic group as a whole vs the non-diabetic group (p<0.0001). Conclusions/interpretation Higher sFlt1 levels, a blunted PlGF rise and an elevated sFlt1/PlGF ratio are predictive of pre-eclampsia in pregnant women with type 1 diabetes. Elevated endoglin levels in women with type 1 diabetes may confer a predisposition to pre-eclampsia and may contribute to the high incidence of pre-eclampsia in this patient group.