In a small number of women, normal pregnancy is not possible because of some anatomical or physiological condition. In 87% of these cases the uterine tubes are incapable of transporting the zygote to the uterus or allowing sperm cells to reach the oocyte. In vitro fertilization and embryo transfer have made pregnancy possible in hundreds of such women since 1978. In vitro fertilization involves removal of secondary oocytes from a women, placing the oocytes into a petri dish, and adding sperm cells to the dish, allowing fertilization and early development to occur in vitro, which means “in glass”. Embryo transfer involves the removal of the developing embryo from the petri dish and introduction of the embryo into uterus of a recipient female. For in vitro fertilization and embryo transfer to be accomplished, a woman is first injected with an LH-Like substance, which causes more than one follicle to ovulate at a time. Just before the follicles rupture, the secondary oocytes are surgically removed from the ovary. The success rate of embryo transfer varies from clinic to, with the age of the embryo at the time of transfer, and with the age of the patient.