December 06 / 2025
Questions regarding the success of a vasectomy reversal are probably the most common and important questions I get. And not unlike the answers to most important questions, it depends…
Succes rates after a vasectomy reversal depend fundamentally on how you define success. Are we talking about sperm returning to the ejaculate? A pregnancy after a vasectomy reversal? Or the delivery of a healthy baby? They’re all quite different end points of success.
So let’s play this out.
Return of Sperm: One measure of success is sperm - more specifically the return of sperm to the ejaculate after a vasectomy reversal. After a vasectomy there should be no, none, zero sperm in the ejaculate. And so a “successful” vasectomy reversal could reasonably defined as the return of sperm to the ejaculate.
This is where you might see some specialist claiming a 99.9% success rate. Truthfully, I think that’s very misleading. Return of sperm to the ejaculate is VERY important. It’s the first critical step. But the devil is in the details. For example, a few dead or non-moving sperm in the ejaculate after a vasectomy reversal could technically be characterized by some as a “success” - sperm are technically present in the ejaculate – but that degree of sperm quantity and quality (a few dead or non-moving sperm) is very unlikely to result in a pregnancy or baby - which is ultimately what couples strive for.
The presence of good concentrations of live, actively moving sperm in the ejaculate is a much more meaningful indicator of success. Moreover, the amount or concentration of moving sperm really needs to be measured in a reliable way, at an experienced laboratory.
In our experience, about 90 to 95% of men will have live active sperm return to the ejaculate following a vasectomy reversal - but there’s a caveat to that which I’ll discuss in a bit.
Pregnancy after a vasectomy reversal: OK, now the presence of live active sperm in the ejaculate is great, but achieving a pregnancy and delivering a healthy baby is really the ultimate definition of success and the presence of sperm in and of itself does not = a baby. In our experience, about 2/3 of couples or about 60 to 75% are able to achieve a pregnancy following of vasectomy reversal.
Even with the availability of good quality sperm, baby making is influenced by a series of complex factor factors. For starters, another person factors into the equation - the female partner. And their age, overall and reproductive health and egg quality are really important determinants of successful baby making. Sperm and egg need to be compatible.
Relationship factors are also important. Some couples may try for a period of time and then may take a break or stop altogether. Some relationships unfortunately don’t last.
Other important determinants of success are the training and experience of the surgeon performing the vasectomy reversal. Not only is their surgical proficiency and skill important, but also their ability to exercise good judgement during the surgery to ensure the most appropriate and reliable vasectomy reversal connections are performed.
Technical factors are essential determinants of success with vasectomy reversal. How the reversal was performed makes a big difference. Was it microsurgical or performed using a surgical microscope (without question the gold standard) or performed without the use of magnification?
What type of reconnection were required and what type of reconnection was performed? They actually can be two different things. Direct vas to vas reconnections or a vasovasostomy (VV) are the most reliable types of connections and generally result in live active sperm returning to the ejaculate in 90 to 95% of cases. However, sometimes direct connections are not indicated and a bypass connection is necessary aka vasoepididymostomy (VE). If a bypass connection is required, we know that those connections are much more delicate and less reliable than direct connections and we typically see live active sperm return to the ejaculate in approximately 75% of patients. That’s the caveat I mentioned earlier.
It’s important to appreciate, that depending on the training and experience of your surgeon, not all doctors performing vasectomy reversals are comfortable completing a microsurgical bypass connection or VE, and will only perform a direct vas to vas reconnection or VV in all circumstances. Unfortunately, we know that if a bypass connection is indicated and not performed, it really compromises the success of the vasectomy reversal. All that to really say that choosing a surgeon with the right experience is really critical to success.
So back to the original question and to summarize things. What is the success rate of a vasectomy reversal?
Ideally couples should expect the return of live active sperm to the ejaculate in over 90% of cases. With that, approximately 60 to 75% of couples are able achieve a pregnancy following of a vasectomy reversal. Please email me directly with any questions: