3. Male CF Patients Are Usually Infertile
About 98 percent of all male CF patients are infertile due to a blockage or total absence of the sperm canal. This defect is called congenital bilateral absence of the vas deferens (CBAVD). The vas deferens is a long tube that carries sperm from the testicles through the male reproductive system. The absence of sperm in the semen makes its impossible to fertilize an egg, and this absence may make the semen thinner.
But there is a difference between being infertile and sterile. Even though the vas deferens is blocked or nonexistent, the sperm is there, and 90 percent of CF patients produce sperm normally. This means that male CF patients can still have biological children through assisted reproductive technology (ART).
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