Medical Specialty >> Reproductive Medicine

Doctors Lounge - Reproductive Medicine Answers

Back to Reproductive Medicine Answers List

If you think you may have a medical emergency, call your doctor or 911 immediately. Doctors Lounge ( does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned on the Site.

DISCLAIMER: The information provided on is designed to support, not replace, the relationship that exists between a patient/site visitor and his/her physician. Please read our 'Terms and Conditions of Use' carefully before using this site.

Date of last update: 10/16/2017.

Forum Name: Fertility

Question: vasectomy and sperm questions

 cypher - Thu Dec 10, 2009 3:39 pm

I recently had a vasectomy 7 months ago, the method was the scalpel method and the vas deferans were clipped and cauterized. I've had 4 sperm tests done in those 7 months and all of them have come back negative. After doing research online and reading about couples getting pregnant after having a vasectomy and having negative sperm tests i was wondering if any of you have heard of this and what chances there are to getting pregnant even if the sperm tests keep coming back negative AND also if the man always withdrawals before ejaculation.

 Dr.M.Aroon kamath - Sat Dec 12, 2009 10:48 pm

User avatar Hi,
That pregnancies can occur post-vasectomy or post-tubectomy is well known.

Some of the causes of pregnancies in the post-vasectomy period are....
- Unprotected intercourse during the immediate post-vasectomy period.
- recanalization of the vas
- or other less common causes which can be called as 'method failure'.

A common recommendation for the post-vasectomy period is to have semen analysis performed 3 months after vasectomy or after 20 ejaculations and use temporary contraception or to avoid intercourse until azospermia is documented.

The time interval from vasectomy to azoospermia is incompletely characterized and may vary according to the vasectomy technique.Thus it is important for couples to understand that men are not sterile immediately after the procedure.

Although most vasectomy failures are said to occur relatively early (within 6 months of the procedure), some may occur more than a year after the vasectomy (most failures occurred within the first 2 years).

Vasectomy failures more than 2 years after vasectomy have also been reported.

Withdrawals before ejaculation are not an insurance against the risk of pregnancies.

Best wishes!

| Check a doctor's response to similar questions

Are you a Doctor, Pharmacist, PA or a Nurse?

Join the Doctors Lounge online medical community

  • Editorial activities: Publish, peer review, edit online articles.

  • Ask a Doctor Teams: Respond to patient questions and discuss challenging presentations with other members.

Doctors Lounge Membership Application

Tools & Services: Follow DoctorsLounge on Twitter Follow us on Twitter | RSS News | Newsletter | Contact us