This procedure is an option for those with non-tubal factor infertility and is similar to IVF because it involves controlled ovarian hyperstimulation and oocyte retrieval. Unlike IVF, potential fertilization takes place in the fallopian tubes. With GIFT, retrived oocytes and sperm are placed in a catheter and transferred under laparoscopic guidance into the lumen of the fallopian tube. Extra oocytes can be fertilized and cryopreserved for later use.