In vitro pregnancy involves the use of special techniques to remove sperm and eggs and then fertilize them in a special culture outside the body to form a fertilized egg, which is then transferred to the uterus to develop into a fetus. In vitro fertilization, also known as IVF, is used to treat male infertility and certain unexplained and difficult-to-treat infertility, using in vitro fertilization to assist fertility patients. The success rate of IVF is still relatively high. The key to successful IVF is the successful implantation of the fertilized egg into the uterus, which depends on the thickness of the uterine lining and the hormone levels in the body. Therefore, after the fertilized egg is grown in vitro, a comprehensive physical examination is needed before transplantation. Only after the thickness of the endometrium reaches a certain standard can the fertilized egg be transplanted into the uterus, otherwise it will easily lead to transplantation failure.