After the glucose tolerance is done behind the maternity test also need to do 4D ultrasound, routine ultrasound, blood and urine routine, liver and kidney function, group B streptococcus screening and other tests. Glucose tolerance test refers to the diabetes test, which can be done at 24~28 weeks of pregnancy. The exact timing of the test varies from person to person. After the glucose tolerance test, a 4D ultrasound is also needed to rule out most of the malformations in the fetus. Routine obstetric ultrasound is also needed several times in late pregnancy to assess the development of the fetus as well as the function of the placenta and the status of amniotic fluid. In addition to this, routine blood and urine tests, liver and kidney functions, serum bile acids, etc., are also required in late pregnancy.