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Post-vasectomy spermogram

Post-vasectomy spermogram

A post-vasectomy spermogram is required to confirm that a vasectomy was successful and that there is no sperm in the semen.

Post-vasectomy spermograms from NASCI

At Biron, we entrust post-vasectomy (PV) spermograms to NASCI Medical Biology. NASCI has built an enviable reputation in the field of fertility spermograms. As a result, they have adapted their extensive expertise to producing a better PV spermogram.

Acquiring a sample is much less restrictive for patients since it is done at home. The patient only visits the clinic to deliver the specimen.

The traditional PV spermogram (in a private or public laboratory) involves counting the sample microscopically using just 0.1 microlitre of sperm. The number of spermatozoa observed is then multiplied by 10,000 to obtain the result in spermatozoa per mL. The observation of a single spermatozoon therefore corresponds to 10,000 spermatozoa per mL. If this single spermatozoon is missed or if the semen sample is not perfectly homogeneous, the result will indicate “no spermatozoa.” It has been established that pregnancy is possible with less than 10,000 sperm per mL.

For this reason, we have replaced the traditional PV spermogram with a flow cytometry count. This new technique allows us to detect quantities of sperm 50 to 100 times smaller than the traditional method used in hospitals and other private laboratories. This translates into a final result of less than 5,000 sperm per mL, which we believe is better proof of a successful vasectomy. In addition, the conditions for obtaining the sample are less complex.

Preparing for the test

16 weeks before the test

Ideally, you should wait 16 weeks and 60 ejaculations before doing the test. This enables you to eliminate as much sperm as possible that was present before the vasectomy. Since the new technique is 50 to 100 times more sensitive than the old one, we can detect the presence of sperm for a longer time. If you decide to do the test earlier (without waiting the recommended 16 weeks) and your result is only slightly positive, you will need to do a control spermogram at your expense a few weeks later.


Results of the new PV spermogram are available within four business days. We estimate that less than 25% of individuals will need to do a control spermogram.

Since implementing this more accurate spermogram, Biron no longer offers the traditional PV spermogram. A note on the report to the physician will clearly indicate that the new technique was used.

If your healthcare professional has prescribed this examination or if you have any questions, contact us at 1 833 590-2715.