Intracytoplasmic Sperm Injection (ICSI) is used when the sperm quality is suboptimal. This is a highly technical procedure where by a single sperm is injected into the centre of an egg to achieve fertilisation.
Stimulation and egg collection in an ICSI cycle are the same as in an IVF cycle. The difference between the two is that in an ICSI cycle, mature eggs are directly injected with sperm instead of being placed together in a dish.