Skip to contentSkip to navigation

Post-vasectomy spermogram

What is a 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 Biron

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 post-vasectomy spermogram with a flow cytometry count. This new technique allows us to detect quantities of sperm 50 to 100 times smaller than the traditionally used method.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.

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.

Preparing for the test

3 months before the test

Ideally, you should wait at least 3 months after the vasectomy before taking the test (unless your doctor tells you otherwise). 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 3 months) 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 post-vasectomy spermogram are available to your doctor within four business days. We estimate that less than 25% of individuals will need to do a control spermogram.

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

MyBiron: Access your test results online

MyBiron: Access your test results online

Biron helps you take charge of your health. Consult your laboratory test results online easily and securely and discover their meaning.

Accessible on all types of devices, safe, free and easy to use, MyBiron allows you to prepare for your visit to the doctor.

*Some results may be sent exclusively to the requesting physician.