The chorionic villus test is performed to determine whether the fetus has any genetic or chromosomal disorders and is performed by drawing blood to check the HCG hormone in the blood. There is no need to make any preparations before the chorionic villus test, and the level of hormones in the blood is not affected by diet, emotions or other factors, so the blood can be drawn at any time and sent for testing in a timely manner. The test can be performed when there is a suspicion of genetic or chromosomal disorders in the fetus during pregnancy. At about 13 weeks of pregnancy, women who have stopped the development of the embryo can have it sent for testing to determine the cause of the embryo stopping. It is also possible to send the embryos to the hospital for examination in a special storage bag after the uterus is cleared. It is recommended that women choose a regular hospital for chorionic villus examination under the operation of a professional doctor, and pay attention to rest after the operation and take anti-infection medication to prevent infection.