Gestational diabetes is developing a high blood sugar during pregnancy and mostly disappear after giving birth. It occurs when the body cannot produce enough insulin to meet the extra needs in pregnancy period. Blood sugar can be reduced through a suitable diet and exercise during pregnancy. If the glucose is not reducing, the patient will need to take the medication as tablet or insulin injections. There are some tests that patient usually follows to check diabetes such as glucose challenge test and oral glucose tolerance test (OGTT).