Klinefelter's syndrome
- Article
- 2021-02-28
KS describes a series of physical, linguistic and social developmental symptoms in men with an extra X chromosome. Its main feature is infertility. Outward signs of KS can be subtle, so symptoms are often not recognized and may not be treated in a timely manner. The NICHD is one of many federal agencies and NIH institutes working to understand KS, discover why it occurs, and identify and treat its symptoms.
Common name
- Klinefelter's syndrome
Medical or scientific names
- Klinefelter's syndrome
- 47, XXY
- XXY syndrome or disorder
- XXY trisomy
- 47, XXY / 46, XY or mosaic syndrome (rare variation)
- Poly-X Klinefelter syndrome, including the following rare variations:
- 48, XXYY (or tetrasomy)
- 48, XXXY (or tetrasomy)
- 49, XXXXY (or pentasomy)
Alternative titles
XXY syndrome
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