Standard in vitro fertilisation (IVF)

A few hours after egg retrieval, when the eggs have adapted to the culture conditions, a specific sperm count per egg is placed on each Petri dish. In the "standard" IVF there is no intervention: the spermatozoa digest the layer of granulosa cells, meet the ovum, adhere to the zona pellucida and one of them penetrates and fertilises the ovum 6 - hours later.