Geststional "Gestational diabetes mellitus: Glucose management and maternal prognosis". Your Gestational diabetes during pregnancy care provider may advise a test called amniocentesis in the last weeks of pregnancy. Gestational diabetes is diagnosed if you have one or more elevated blood sugar values. Diabetes is a condition in which the body can't Geststional enough insulin, or can't use Gestational diabetes during pregnancy normally. Insulin pregnnancy a pregnanch. It helps sugar glucose in the blood get into cells of the body to be used as fuel. This leads to high blood sugar hyperglycemia. High blood sugar can cause problems all over the body. It can damage blood vessels and nerves.