Post-Vasectomy Semen Analysis

Timing: Wait at least 12 weeks after your vasectomy before testing. This gives time for any residual sperm to clear from your system.

Clear the pipes: You must have ejaculated at least 20 times since your vasectomy before this test. This helps flush out any remaining sperm from the vas deferens above the vasectomy site.

Abstinence: Avoid ejaculation for 2–5 days before your test. No less than 2 days and no more than 7 days.

On the day: When you arrive, you'll be shown to a private room. Wash your hands and genitals with soap and water before producing your sample. Do not use lubricants, saliva, or condoms.

Collect everything: It's important to collect the entire ejaculate. If any of the sample is lost (especially the first portion), please inform the laboratory staff as this may affect the accuracy of results.

Why do I need to wait 12 weeks?
Sperm can survive in the vas deferens above the vasectomy site for several weeks after the procedure. Waiting 12 weeks and having 20+ ejaculations ensures any residual sperm have been cleared, giving an accurate result.

What if sperm are still present?
If non-motile (non-moving) sperm are found, you may be asked to repeat the test in 4 weeks. If motile (moving) sperm are present, this may indicate the vasectomy was unsuccessful or has reconnected—you should consult your GP or urologist.

Will I need more than one test?
Most men only need one test if the result shows azoospermia (no sperm). If sperm are present, you may need follow-up tests at 4-week intervals. Some guidelines recommend two clear samples before confirming success.

Can I produce my sample at home?
No. For post-vasectomy analysis, the sample must be produced on-site at the laboratory. This ensures the sample is analysed promptly and at the correct temperature for accurate detection of any sperm, including whether they are motile.

What happens if my vasectomy failed?
Vasectomy failure is rare (around 1 in 2,000). If motile sperm persist, your urologist may recommend a repeat vasectomy procedure. Continue using contraception until you receive clearance.