As the eggs are retrieved, usually by transvaginal aspiration, they are identified by the embryologist and placed in the incubator to avoid exposure to light, temperature and pH changes. Brief notes are made on the eggs’ condition.
Normally about 75% of eggs will be mature and ready to be inseminated by conventional IVF (cIVF) or injected by intracytoplasmic sperm injection (ICSI). After retrieval, the eggs remain in the incubator to complete their final stages of maturation. This normally occurs between four and eight hours after retrieval.