Diabetes is a condition in which the body can't make enough insulin, or can't use insulin normally. Insulin is a hormone. It helps sugar (glucose) in the blood get into cells of the body to be used as fuel. When glucose can’t enter the cells, it builds up in the blood. This is called high blood sugar (hyperglycemia).
Gestational diabetes is a type of diabetes that happens during pregnancy. The symptoms of gestational diabetes usually go away after delivery. But sometimes they do not, or you may develop type 2 diabetes later.
A blood glucose screening tests for gestational diabetes. With this disease, changes in your body during pregnancy cause your blood sugar (glucose) to be too high. This is a serious condition. But it can be controlled with diet and, if needed, medicine.