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A vasectomy (pronounced va-SEK-t uh -mee) is a surgical procedure performed as a contraceptive in men. It involves cutting the tubes (the vas deferens, pronounced VAS DEF-uh-renz) that carry sperm from the testicles. Only about 15 out of 10,000 couples get pregnant in the year after the man has a vasectomy. 1 As part of a research program on the safety and effectiveness of male contraception, the NICHD supports studies and other activities that advance the understanding of vasectomy. Common name Vasectomy Medical or scientific name Vasectomy

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