In vitro fertilization (IVF) is a procedure for couples with fertility problems to have children. During the first half of the cycle, drugs are given to inhibit FSH and LH secretion. This suspends the menstrual cycle. High doses of FSH are given for about 12 days. This is to stimulate ovaries to develop multiple follicles. This is called superovulation. When the follicles are fully developed, HCG is given to stimulate the follicles to mature. Mature eggs are collected a day and a half later. Eggs and sperm are mixed in a culture dish and placed in an incubator for 2 days. Prior to implantation, the female is given progesterone to thicken the lining of the uterus. One to three embryos are implanted into the uterus. The remaining embryos can be frozen.

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