During embryo freezing, ovaries are stimulated with daily hormone injections for 10-14 days in order to produce multiple eggs. When the eggs are mature they are collected through a simple vaginal ultrasound-guided procedure. The partner’s sperm (or donor sperm) is then added to the eggs in the hope that they will fertilise and develop into embryos. Any resulting healthy-looking embryos are labelled, frozen and stored in liquid nitrogen.
When a woman wants to try to have a baby, and her ovaries are no longer working, an embryo is thawed and transferred to her uterus. However, embryo transfer does not guarantee pregnancy. The chance of pregnancy depends on the number and quality of embryos stored, as well as the woman’s age when the embryos were frozen.
Embryo freezing is an established procedure which provides an excellent chance of having a baby after cancer treatment.