 The CGMS has been studied in non-pregnant patients where it has demonstrated clinical usefulness by enhancing decision-making through detecting previously unrecognized postprandial hyperglycemia and nocturnal hyper-and hypoglycemia 16. Scientific evidence on a HbA1c-reducing effect of CGMS use is limited 17, 18. Although some studies do evaluate the effect of CGMS use on biochemical endpoints, such as HbA1c levels, data on clinical endpoints like diabetic complications, are lacking. The usefulness of CGMS use during pregnancy has hardly been evaluated up to now 18. 