Generally speaking, it is recommended to complete the program of regular maternity tests on time. If a pregnant woman under 35 years of age has a normal Down’s syndrome test, then there is no need for further non-invasive DNA or amniocentesis tests; if a pregnant woman is over 35 years of age, she can directly undergo non-invasive DNA or amniocentesis tests. Pregnancy checkups generally include general checkups, routine special pregnancy checkups, and special checkups, each of which has quite a number of items. 1. General checkups: General checkups refer to vital signs monitoring, blood tests, such as blood pressure, pulse, blood routine, infectious diseases, etc. to determine and assess the health status of pregnant women. 2. Routine special pregnancy checkups: some special checkups to screen for possible abnormalities, such as Down’s syndrome screening, NT ultrasound, glucose tolerance test, 4D ultrasound. 3. Special examination: when the Down’s syndrome screening suggests high risk or age > 35 years old, in order to prevent problems with the fetus in the womb can be further non-invasive DNA, amniocentesis and so on. Pregnancy test must go to the regular medical institutions, follow the doctor’s advice reasonable pregnancy test.