Several factors affect the chances of success including:
- Surgical technique and quality of reversal operation
- Surgical technique of original vasectomy
- Time elapsed since vasectomy
- Presence of anti-sperm antibodies
Success is generally defined as the presence of healthy sperm in a postoperative semen sample. There is a steady decline in success rate as the time since the vasectomy increases.
Although the success rate declines with the passage of time since the vasectomy, stunning successes have been achieved at The Vasectomy Reversal Clinic for those undergoing a microsurgical reversal of vasectomy even after more than 20 years after the vasectomy.