The third trimester of pregnancy usually requires an NT test, related laboratory tests and an electrocardiogram for pregnant women. NT examination refers to the examination of fetal nuchal translucency, which is usually performed from the 11th to the 13th week of pregnancy, and the initial screening of NT can determine whether the fetus is at risk of chromosomal diseases. At the same time, at this stage, it is also necessary to follow the doctor’s instructions to carry out blood screening, urine routine, blood type, fasting blood glucose, liver and kidney function, Hepatitis B pentameter, as well as AIDS and syphilis blood sampling screening. At this stage, pregnant women also need to undergo an electrocardiogram to rule out any cardiac abnormalities. The tests are performed under the supervision of a doctor in the third month of pregnancy.