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A vasectomy is a surgical procedure that involves blocking the path of sperm by cutting, or tying a man's vas deferens.
This will prevent sperm from becoming part of the ejaculate (semen), and makes the man sterile. Following a vasectomy, sperm are still produced in the testicles but are absorbed by the body. A vasectomy takes about 15-20 minutes and can usually be carried out with a local anaesthetic. Two small cuts are made in the scrotum, then the vas deferens is cut and tied.
Vasectomy is not immediately effective because live sperm remain in the vas deferens until they are ejaculated in the semen. After three months a semen analysis must be taken to check that there are no live sperm in the ejaculate. Once this is established, vasectomy is 99.85-99.9% effective. This means that, on average, of 1000 women whose partners have had a vasectomy, only1 of them will become pregnant at some time in the future.