Following are at risk of diabetes of pregnancy
– BMI above 30 kg/ m2
– Previous baby weighing 4.5 kg or more
– Family history of diabetes in first degree relatives
– Ethnicity with high prevalence of diabetes
How to screen
By 75 gms 2 hours oral glucose tolerance test at 24- 28 weeks
Previous gestational diabetes
Early self blood glucose monitoring or 75 gms 2 hours oral glucose tolerance test at booking if normal then further at 24- 28 weeks.
Glucosuria
offer 75 gms 2 hours OGTT if 2+ glucosuria at one occasion or 1+ at 2 occasions.
Diagnose gestational diabetes if
Fasting glucose 5.6 mmol/L (100.8 mg/dL) above or
2 hours glucose 7.8 mmol/L (140.4 mg/dL) above