Question: Persistent sperm after a vasectomy?

From Vasectomy.com

My husband had a vasectomy 8 months ago he has had more then 40 ejaculation since his surgery, or maybe even more. The semen analysis came back with more then 20 hpf. Motile and non motile sperm were seen. Could his vasectomy have failed, or can it take a long time to become sterile? Thank you.

Dr. McHugh’s answer:

There two scenarios here. It is possible that the vasectomy has successfully divided the vas and that the sperm are, for whatever reason, slow to completely clear. If this is the thinking you would re check after another twenty or so ejaculations. On the other hand this may represent a recanalization of the vas tubes, a small channel, that has reconnected the vas tubes. In this case another vasectomy would be performed. A couple of things: You could have a formal semen analysis performed to actually get a count, it is possible that 20 per highpower field correlates with a very low total count. Some feel that after a vasectomy less than 100,000 on a semen analysis is acceptable. I have experienced your particular situation about five times in my career and I have repeated the vasectomy. Interestingly each time it corrected the small numbers of sperm that persistently showed up on microscopic exam.

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