In the third trimester of pregnancy, lab tests such as NT test, early Down’s screening or non-invasive DNA, blood, urine, stool and other routines, liver and kidney functions are usually done. First of all, NT test, NT refers to the thickness of the posterior nuchal translucency layer, this thickness can be measured by ultrasound, which can diagnose whether there is chromosomal abnormality in the fetus, which is an important indicator. The test is usually done between 11 and 13 weeks of pregnancy, so in the third trimester, it is mandatory to have an NT test. Secondly, it is necessary to do early Down’s syndrome screening. After doing NT, blood tests can be taken, combining the indexes of the blood test and the value of the NT test to jointly calculate the risk value of trisomy 21 and trisomy 18 of the fetus, which is the purpose of early Down’s screening. For those who are financially better off, non-invasive DNA can be used as a blood test, which is more accurate in diagnosing trisomy 21 and 18 in fetuses. In addition, pregnant women are required to undergo a comprehensive physical examination, which includes blood, urine and stool, as well as an ultrasound to check for fetal heartbeat, and blood system screening, including blood counts, coagulation, liver and kidney function, hepatitis B, syphilis, HIV, thyroid function, and other aspects of the blood system. After the above tests are completed, it means that the early pregnancy tests are basically completed. It is recommended that you take care of yourself during pregnancy and get enough sleep. If there is any discomfort, please go to the hospital immediately.