Diabetes Type One in Pregnancy and Continuos Glucose Monitoring

Inclusion Criteria: * confirmed diagnosis of type one diabetes * duration of the disease for minimum of one year before inclusion in the study * multiple daily insulin injection therapy or insulin pump * glycemia monitoring with continuous glucose monitoring systems (FreeStyle Libre Flash Glucose Monitoring System, Abott) for a minimum of 3 months before inclusion in the study * glucose data availability from the sensor \> 80% for a determined period of monitoring * patient age \> 18 years and \< 40 years * available medical records from the preconception period (3 months before conception) * first trimester of pregnancy * body mass index \< 25kg/m2 * glycated haemoglobin \< 7.0% * signed informed consent Exclusion Criteria: * other types of diabetes except type one: type 2 diabetes, diabetes developed during pregnancy, diabetes as a result of genetic defect of beta-cells of the pancreas * using other therapy besides insulin in treating diabetes * changes to the specific insulin therapy in preconception period or during pregnancy; defined as switching from multiple daily insulin injection therapy to insulin pumps and vice versa * patient's inability for regular hospital visits (defined as once monthly during pregnancy) * patients unable to understand the protocol and the goal of the study * patients unable to read and write * multiple pregnancy * glycated haemoglobin \> 7.0% in all pregnancy trimesters * significant weight gain during pregnancy (\>20 kilograms) * glucose data availability from the sensor \< 80% * unavailability of preconception medical records * unavailability of medical records from pregnancy and pregnancy outcomes