The success rate of vasectomy reversal can be defined in two ways. The chance of return of sperm after a vasectomy reversal depends on a lot of factors including:
The length of time since vasectomy
Experience and skill of the surgeon
Patient’s adherence to post-surgical instructions
In general, about 85-95% of men who undergo a vasectomy reversal have return of sperm after the procedure. The chance of spontaneous pregnancy; however, is lower. This depends on the quality of sperm, the fertility potential of the female partner, and other factors such as patient’s age, health, and environmental exposures.