(47 XXY Syndrome; KS)
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- Smaller birth weight and slower muscle and motor development
For children and adults:
- Tallness with extra long arms and legs
- Abnormal body proportions (long legs, short trunk)
- Enlarged breasts (common)
- Lack of facial and body hair
- Small firm testes, small penis
- Lack of ability to produce sperm (common)
- Diminished sex drive, sexual dysfunction
- Social and learning disabilities (common)
- Personality impairment
- Attention deficit hyperactivity disorder (ADHD)
- Normal to borderline IQ
- Speech and language problems—Children with KS often learn to speak later than other children do. They may have a difficult time reading and writing.
- Increased strength
- More muscular, male appearance
- Growth of facial and body hair
- Better self-esteem
- Modulation of mood
- Increased energy
- Increased ability to concentrate
- Greater sex drive
- Improved bone density
Speech and Language Therapy
- Speech therapy
- Special education services
- Extra support and help with learning from parents and teachers
- Social skills training and psychological counseling
Klinefelter Syndrome and Associates http://www.genetic.org/
National Institute of Child Health & Human Development http://www.nichd.nih.gov/
Canadian Psychiatric Association http://www.cpa-apc.org/
Canadian Psychological Association http://www.cpa.ca/
Bacino, CA, Lee, B. Sex Chromosome Aneuploidy. In: Kliegman: Nelson Textbook of Pediatrics . 19th ed. Philadelphia, Pa: WB Saunders; 2011.
Klinefelter syndrome. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed . Updated April 27, 2011. Accessed October 11, 2011.
Klinefelter syndrome. Klinefelter Syndrome and Associates website. Available at: http://www.genetic.org/knowledge/support/action/199/#Brief%20Introduction%20to%20Klinefelter%20syndrome . Updated February 2007. Accessed July 22, 2008.
Larsen PR. Williams Textbook of Endocrinology. 10th ed. Philadelphia, PA: Saunders; 2003.
Understanding Klinefelter syndrome. National Institute of Child Health & Human Development website. Available at: http://www.nichd.nih.gov/publications/pubs/klinefelter.cfm . Updated August 2006. Accessed July 22, 2008.
- Reviewer: Kari Kassir, MD
- Review Date: 09/2012 -
- Update Date: 00/92/2012 -