ICSI is an advanced form of IVF, used to combat issues related to the sperm. This can include problems with sperm count, motility or normal formation of sperm.
The pathway is very similar to IVF except a different technique is used to try to achieve fertilisation. Here, a single sperm is injected into a mature egg to maximise chances of conception.
ICSI can be used in combination with SSR (Surgical Sperm Recovery) for severe cases where there is a complete absence of sperm in the ejaculate (azoospermia).