Summary: For post-vasectomy semen analysis (PVSA), microscopic examination of a single uncentrifuged specimen at 10 weeks may be just as reliable, and technically easier, for identifying semen samples after vasectomy with more than 100,000 sperm per ml.

http://www.ncbi.nlm.nih.gov/m/pubmed/18804227/

Strength of Recommendation = B

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