Generally pregnancy 4D needs to be done between 20 to 24 weeks of pregnancy.
During pregnancy, pregnant women should under the guidance of the doctor on time to carry out the relevant detector test, such as ultrasound to determine the NT (fetal nuchal translucency thickness), Down’s syndrome screening, non-invasive prenatal testing technology to screen the risk of chromosomal disorders in the fetus, and to carry out the examination of the fetal structural system, that is, the four-dimensional ultrasonography, which is able to screen the risk of the occurrence of the structure of the fetus, between the 20th and 24th weeks of pregnancy.
During pregnancy, reasonable and standardized obstetrical examination should be ensured, which can screen out the high risk factors of pregnancy, and can timely detect pregnancy complications or complications, and timely intervention can be given to reduce the risk of pregnancy, and can also early detect the risk of abnormal development of the fetus, so as to improve the quality of pregnancy and reduce the damage to the pregnant woman’s body.