What happens in in vitro fertilization?

An in vitro fertilization treatment cycle can be divided into five steps:

1. Ovarian stimulation, which uses medications to increase the number  of eggs available
2. Egg collection
3. Embryology, which covers preparing the eggs for fertilization, adding sperm to the eggs to create embryos; care of the embryos in the laboratory, and freezing any suitable spare embryos
4. Embryo transfer of one or sometimes two embryos into the uterus
5. Luteal phase, which covers preparing and maintaining  the uterus to allow an embryo to implant and give rise to pregnancy