Intra-cytoplasmic sperm injection (ICSI) is used for the same reasons as IVF, but especially to overcome sperm problems. Essentially, ICSI follows the same process as IVF, except ICSI involves the direct injection of a single sperm into each egg to achieve fertilisation.
Because it requires technically advanced equipment, there are additional costs for ICSI. For couples with male factor infertility, ICSI is needed to fertilise the eggs and give them a chance of having a baby. But, for couples who don’t have male factor infertility, ICSI offers no advantage over IVF in terms of the chance of having a baby.