Egg banking requires that a patient undergo ovarian stimulation and a minor surgical procedure to acquire eggs. The eggs are chilled by ultra-rapid freezing called vitrification. Upon thawing, in vitro fertilization procedures are needed to inseminate the eggs with sperm and to grow embryos. Either sperm from her partner or from a sperm donor may be used to fertilize the eggs through a technique call ICSI (intracytoplasmic sperm injection). Selected embryos may then be transferred into the patient’s uterus.