First Trimester Prediction of Gestational Diabetes Mellitus by Continuous Glucose Monitoring.

Inclusion criteria

• Maternal age ≥ 18 years
• Planned antenatal care at the same centre (i.e. not planning to move before delivery).
• Singleton pregnancy.
• Informed and written consent.

Exclusion criteria

• Age <18 years;
• Multiple pregnancy in current pregnancy;

• Unconscious or very ill; · Serious mental illness;
• Learning difficulties;
• Not fluent in local language and absence of interpreter;
• Severe congenital anomaly on ultrasound;
• Pre-existing diabetes mellitus type 1 or 2;
• Patients undergoing metformin therapy for infertility.
• Significant pre-pregnancy comorbidities that increase risk in pregnancy, for example renal failure, severe liver disease, transplantation, cardiac failure, psychiatric conditions requiring in-patient admission (<1 year);
• Significant co-morbidity in the current pregnancy, nephropathy (estimated GFR <60ml/min), other physical or psychological conditions likely to interfere with the conduct of the study and/or interpretation of the trial results;
• Participating in another intervention study that influences outcomes of this study;
• Allergy to adhesive materials;
• Allergy to any of the components of the glucose test: