There are some screening test for gestational diabetes.
The first test is called the oral glucose tolerance test. During the test the pregnant woman will consume a drink containing 50g of glucose. After one hour her blood glucose level is tested and if it is equal to or greater then 130 to 140 mg/dl then further testing is needed.
The next test to determine if a woman has gestational diabetes is the 3 hour, 100g oral glucose tolerance test. This test actually lasts about three days. For the three days before the test the woman eats an unrestricted diet eating at a minimum of 150g of carbohydrates each day. The night before the test she fasts and in the morning drinks a 100g oral glucose solution. Her plasma glucose is tested at four different intervals with blood glucose levels.
