A couple is advised to use barrier methods after vasectomy till :
It is imperative that some other contraception should be used for the next three months or 15 ejaculation. At the end of the period semen analysis should be done to confirm the absence of sperm in the ejaculate. TEXTBOOK OF GYNECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 396
3 months
No sperms in ejaculate
Next 15 ejaculations
None of the above
Contraception