Two Main Pathways: A total lack of sperm results from either obstruction of flow or failure to produce. Blood testing for low hormones is always done. If the brain hormones and semen volume are normal, a testicle biopsy can evaluate for any sperm production as well as get a few sperm. Obstruction can occur from absence of the vasa or blockage/scarring of the tubes. If not fixable, sperm harvesting can be done.
Answered 7/8/2013
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