Azoospermia is the medical condition of a man not having any measurable level of sperm in his semen. It is, unsurprisingly, associated with very low levels of fertility.
Azoospermia has two forms:
– obstructive azoospermia, where sperm are created, but cannot be mixed with the rest of the ejaculatory fluid due to a physical obstruction, and;
– non-obstructive azoospermia, where there is a problem with spermatogenesis.