Summary: For post-vasectomy follow-up, a post-vasectomy semen analysis (PVSA) utilizing one specimen showing azoospermia after 3 months and 20 ejaculations may be just as reliable at assuring sterility as typical two-specimen protocols, but with fewer required follow up visits.

http://www.ncbi.nlm.nih.gov/m/pubmed/15947571

Strength of Recommendation  = B

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