Intracytoplasmic Sperm Injection (ICSI) is an IVF technique, where a single sperm is injected directly into an egg. This technique is usually used for treatment of severe cases of male-factor fertility, e.g. low sperm quality, low number of sperm or if sperm has been surgically retrieved, i.e. testicular aspirate for azoospermic / vasectomy patients. A medium called Sperm Slow is used during sperm selection. By using this technique the scientists are preferentially using the better-quality sperm. This method is also known as PICSI and is standard practice with no additional costs. As with IVF, once the egg is fertilised, the embryos are incubated, then transferred back to you.