Azoospermia

Azoospermia is the medical condition of a man whose semen contains no sperm. It is associated with male infertility, but many forms are amenable to medical treatment. In humans, azoospermia affects about 1% of the male population and may be seen in up to 20% of male infertility situations in Canada.

Not to be confused with aspermia, which refers to the absence of semen in a male.
Azoospermia
Semen analysis revealing no sperm cells and multiple white blood cells
SpecialtyUrology 

In a non-pathological context, azoospermia is also the intended result of a vasectomy.

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