Embryo transfer is a very important step in the in vitro fertilization (IVF) procedure, in which one or more embryos are transferred into the uterus to establish pregnancy. The process is quite straightforward, with a thin tube (catheter) used to transfer the embryos into the uterus, usually after the embryos have been cultured for a few days. The transfer is done under ultrasound guidance to ensure accurate placement. Embryo transfer treatment success rates are based on several factors, such as the quality of the embryos, the woman's age, the health of the uterus, and the IVF process as a whole. In order to achieve maximum success, patients are encouraged to adhere to certain guidelines. These include living a healthy lifestyle, staying away from stress, and following medication schedules recommended by the fertility expert. Timing of the embryo transfer is also very important, as it must be synchronized with the endometrial receptivity.