Generally speaking, the whole process of IVF is that the wife must start receiving Gonadotropin Releasing Hormone analog (GnRHa) on the 21st day of the previous menstrual cycle, in order to block the stimulating effect of the hypothalamus on the pituitary gland, so that it cannot secrete gonadotropin on its own. The treatment lasts about 14 to 18 days. The treatment lasts about 14 to 18 days. Then, after the woman has entered her menstrual cycle, she is given ovulation medication to stimulate her ovaries to produce more follicles and must be monitored regularly by ultrasound and blood tests to track the changes in the blood levels of the hormones to determine the best time to retrieve eggs. The smallest follicle in the ovary is only 0.1 to 0.2 mm in diameter and is called the primordial oocyte. The follicle is about 5 mm in diameter at the beginning of menstruation and its growth is stimulated by Follicle Stimulation Hormone (FSH), which allows the follicle to continue to grow to about 8 mm in size. When the follicle diameter increases to 15 mm, the secretion of FSH becomes even more intense, and the large amount of FSH induces the release of Luteinizing Hormone (LH) from the subiculum, which causes the thinning of part of the follicle surface. Then, 36 hours before the egg collection, the patient should be reminded to inject human chorionic gonadotropin (hCG) to prepare for the egg collection. On the day of egg collection, the eggs are collected under vaginal ultrasound guidance and the follicular fluid is sent directly to the laboratory for processing. The semen of the husband is washed and screened, and the eggs of the wife are cultured for 2 to 5 days. The fertilized eggs develop into mature embryos, which are then implanted into the fallopian tubes or uterine cavity of the wife. Usually, after stimulating ovulation, the luteinizing hormone still remains in the granulosa cells and endometrial cells of the follicle wall, turning them into luteal cells. The luteal body secretes large amounts of luteinizing hormone (Progesterone , P4) to facilitate the embryo implantation. In-Vitro Fertilization/Embryo Transfer (IVF/ET) After washing and screening, the semen of Mr. Fertilization is cultured directly with the egg in the embryo culture chamber in vitro. The embryo is then implanted into the uterine cavity through the vagina and cervix. It is suitable for women with obstruction or adhesion of both fallopian tubes, or for infertile women who have failed several times to undergo IUI.