About one man in a hundred produces no sperm or very few sperm in his semen – a condition known as azoospermia and oligospermia. Various factors can contribute towards these conditions, for example:
- Vasectomy (the male sterilisation operation).
- Illness (eg, mumps in adolescence).
- Trauma or injury to his groin.
- A genetic condition.
SSR is usually planned in advance but in exceptional circumstances can also be carried out as an emergency procedure if the man is unable to produce a sperm sample on the day of his partner’s egg collection.