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Are there live spermatozoa after vasectomy?

By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 09/01/2022

For the first few months after vasectomy, the vas deferens of the male still harbors sperm that have not been ejaculated, some of which may still be alive. During this time, there is a degree of post-vasectomy oligozoospermia until all sperm have been completely eliminated with several ejaculations.

 Zaira Salvador
Zaira Salvador
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV
Embryologist. Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI) License: 3185-CV.