The Pregnancy GTT test or the glucose tolerance test is carried out to determine your sensitivity to the same, during your pregnancy. This test is used to determine if you have developed gestational diabetes during the course of your pregnancy; it is not unheard for women who have not had diabetes to develop the same during the course of their pregnancy. This is why this test is important and crucial both for you and the health of your baby as well. A glucose tolerance test should clearly indicate to the doctor as to how well your body is able to absorb sugar and indicate whether you have developed diabetes or not. In case of a positive result, your doctor would recommend a course of treatment to help you better control your current condition and to safeguard your health and that of your fetus.