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Klinefelter syndrome (XXY)

Syndroma Klinefelter (47,XXY) · Klinefelterův syndrom (XXY)

male only

What it is

A boy with an extra X chromosome: small firm testes, low testosterone and infertility — common (1 in 600) and mostly undiagnosed.

Symptoms & signs

  • Small firm testes
  • tall with long legs
  • breast development
  • little body hair
  • infertility
  • learning and language difficulties

🚩 Get help if…

  • call 112 / 911 now One leg swollen and painful, or sudden breathlessness
  • see a doctor soon Small, firm testes and no deepening voice at puberty
  • see a doctor soon A breast lump in a man
  • see a doctor soon No pregnancy after a year of trying

Where it strikes

Medical treatment

  • Karyotype
  • testosterone replacement
  • sperm retrieval (micro-TESE) and IVF
  • speech and learning support
  • bone density checks

Natural & lifestyle

  • Exercise
  • healthy weight
  • bone care

Emerging & experimental

  • Sperm preservation in adolescence
  • germ-cell research

Alternative, off-label & anecdotal

Approaches used outside the guidelines, with what their supporters report and what testing has found so far.

  • Herbal testosterone boosters — cannot replace failing testes anecdotal / traditional
  • Vitamin D and exercise — for bone strength early / small studies
  • Zinc supplements — anecdotal anecdotal / traditional

ICD codes