The 4D and glucose test can be done on the same day, but it is best to do the 4D after the glucose test. The 4D ultrasound is usually done at 22-26 weeks of pregnancy, and the glucose test is done at 24-28 weeks of pregnancy. There is an overlap of pregnancy weeks between these two tests, so you can choose a day during the 24-26 weeks of pregnancy to have both tests done. However, both tests take a longer time, so pregnant women should be prepared. Pregnant women can go to the hospital on an empty stomach and have their fasting blood glucose drawn first, and have their blood drawn for 1-hour and 2-hour blood glucose checks after taking sugar water orally. When the sugar test is done, you can have some breakfast to replenish your energy, and move around appropriately to increase the excitement of the fetus and promote fetal activity, and then do the 4D ultrasound, which will try to put the fetus in the right position to help with the test.