Specific conditions

Congenital absence of the vas deferens and CFTR testing

The vas deferens is a tube that carries sperm. When both tubes are absent from birth, sperm may not reach the ejaculate even when production continues. This is not the same as having no sperm production; examination and appropriate investigations establish the situation.

Congenital absence of the vas deferens and CFTR testing

How the transport problem is assessed

A urology/andrology specialist reviews semen analyses, semen characteristics and examination together. Imaging or additional investigations are requested when indicated. Low semen volume alone cannot diagnose absent tubes; collection difficulties and other ejaculatory problems may need consideration. One-sided and two-sided findings do not mean the same thing. The clinician also considers associated structural findings and whether the urinary tract or kidneys should be assessed. Bring complete reports so that the actual anatomy, rather than a presumed blockage, guides discussion.

Why CFTR testing can be relevant

Congenital absence of the vas deferens is associated with CFTR gene changes in some people. Having no obvious lung or digestive symptoms does not make a genetic assessment unnecessary. The test’s coverage, the identified change and its classification all matter. Not every CFTR finding has the same meaning. In particular, a variant of uncertain significance should not be presented as a definite disease diagnosis. Clinical genetics input can clarify what is established and what remains uncertain.

Why the partner may also need assessment

When a relevant CFTR change is found, genetic evaluation of the partner and counselling about a possible child may be discussed. Risk depends on both partners’ findings, rather than one laboratory report alone. Counselling covers inheritance, limitations of testing and reproductive options. Requesting a genetic investigation does not mean that a particular embryo test or treatment is automatically appropriate or available. Ask the team to explain the options within your clinical and regulatory circumstances before making decisions.

Connecting retrieval and the IVF plan

If the overall assessment supports it, surgical sperm retrieval and ICSI may be discussed with the relevant specialists. Absent tubes do not guarantee retrieval or pregnancy. Bring genetic reports, hormones, semen results, imaging and any previous procedure records. Useful questions include whether the anatomy is confirmed, which partner tests are relevant, and how the urology and IVF stages would be coordinated. Consider the female partner’s assessment and agree how findings will be communicated between teams.

Frequently Asked Questions

Are CFTR investigations unnecessary without chest symptoms?

No. Reproductive tract findings can occur without obvious other symptoms. A specialist decides which genetic evaluation is appropriate.

Does absent vas deferens necessarily affect sexual function?

No. Sperm transport, desire, erections and orgasm are different processes. New or troublesome symptoms deserve their own assessment.

Scientific sources

  1. uroweb.org ↗
  2. medlineplus.gov ↗

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