Why is there a wide difference in the recommended time frame for post vasectomy semen analysis?

My paperwork said about eight weeks. At my one week check up I was healing great and my Urologist said I could take my test at 5 weeks. Also I am only taking 1 test as required in my case. I'm seeing that two tests are the normal recommendation.

Answers from doctors (2)


More About Doctor John C. McHugh, MD

Published on Oct 18, 2017

There is a wide variation in how soon the sperm clear. Although there are several factors the most important is the number of ejaculations and the usual number is about 25-30. When the physician says check after so many weeks he is assuming that the number of ejaculations will be reached at that time interval. One vs. two check: I think two is a good idea. I check the specimens myself with a microscope and I feel better knowing two are negative before I give the green light. Just like everything else-everybody does things a little different.

Answered by John C. McHugh, MD (View Profile)

There is a wide variation in how soon the sperm clear. Although there are several factors the most important is the number of ejaculations and the usual number is about 25-30. When the physician says check after so many weeks he is assuming that the number of ejaculations will be reached at that time interval. One vs. two check: I think two is a good idea. I check the specimens myself with a microscope and I feel better knowing two are negative before I give the green light. Just like everything else-everybody does things a little different.

Published on Jul 11, 2012


Robert G. Pugach, M.D.

Published on Oct 17, 2017

There are two ways to time samples: the number of ejaculations or the number of weeks. It takes about 15-20 ejaculations to clear the vas of sperm from the Vasectomy site to the prostate (where the ejaculate comes out) OR about 8 weeks. There are many variables — number of sperm in the vas, the ejaculate volume, amount of post-vasectomy inflammation, etc. A single sample that shows 0 sperm is all that's needed. If a sample shows only a few dead sperm it should be repeated until the count is 0.

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Answered by Robert G. Pugach, M.D.

There are two ways to time samples: the number of ejaculations or the number of weeks. It takes about 15-20 ejaculations to clear the vas of sperm from the Vasectomy site to the prostate (where the ejaculate comes out) OR about 8 weeks. There are many variables — number of sperm in the vas, the ejaculate volume, amount of post-vasectomy inflammation, etc. A single sample that shows 0 sperm is all that's needed. If a sample shows only a few dead sperm it should be repeated until the count is 0.

Published on Jul 11, 2012


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