Stimulated cycle

IVF was developed over 30 years ago and is today the most common and effective type of fertility treatment. Hormones are given to the woman to stimulate the ovaries to produce excess follicles, where eggs develop. Approximately 9-14 days after stimulation has begun, an injection of hCG is given. Egg collection is performed 35-38 hours later under sedation and lasts approximately 10-30 minutes. Once the eggs are removed from the follicles, they are incubated with a sperm overnight. The following morning the embryologists will assess the eggs for microscopic signs of fertilisation. A fertilised egg will divide and grow from one cell into 2-4 cells on day 2, 6-8 cells on day 3 and to the blastocyst stage on day 5 or 6. The timing of your embryo transfer is determined by our ability to choose the best embryos for transfer. At times this decision can be made at day 2 or 3 (normally when the group of embryos is small and there are fewer to choose from). In many cases the embryos will be cultured to day 5 or 6 when the embryo is no longer a cluster of a cells, but a structured embryo called a blastocyst. Blastocyst embryo transfer is associated with a better pregnancy rate compared to transfer on day 2 or 3 when there are several embryos to select from. Any remaining good quality embryos at day 5 or 6 can be vitrified (frozen) for future use. Approximately 14 days after the embryo transfer, a blood or urine pregnancy test is performed.