Diseases & Conditions


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Klinefelter Syndrome


Synonyms of Klinefelter Syndrome
  • No synonyms found

Disorder Subdivisions

  • No synonyms found


General Discussion
Klinefelter syndrome is a group of chromosomal disorders in males in which one or more extra X chromosomes are present. Males with the classic form of the disorder have one extra X chromosome. Males with variant forms of Klinefelter syndrome have additional X and/or Y chromosomes. The extra X and/or Y chromosome can effect physical and intellectual development. Common physical features may include small testes (hypogonadism), , delayed pubertal development, and breast development (gynecomastia) in late puberty. These features may be associated with low testosterone level and elevated gonadotropin levels.

Organizations related to Klinefelter Syndrome
  • 49XXXXY
    870 Miranda Green
    Palo Alto CA 94306
    Phone #: 360-892-7547
    800 #: --
    e-mail: epwatzka@iname.com
    Home page: N/A
  • American Association for Klinefelter Syndrome Information and Support
    2945 West Farwell Ave.
    Chicago IL 60645-2925
    Phone #: 773-761-5298
    800 #: 888-466-5747
    e-mail: KSinfo@aaksis.org
    Home page: http://www.aaksis.org
  • Klinefelter Syndrome & Associates (KS&A)
    11 Keats Court
    Coto de Caza CA 92679
    Phone #: 888-999-9428
    800 #: 888-999-9428
    e-mail: khenry@genetic.org
    Home page: http://www.genetic.org
  • Klinefelter Syndrome Association of Canada
    1001 Queen Street West
    Ontario None M6J 1H4
    Phone #: 416-535-8501
    800 #: --
    e-mail: drabinovitch@hotmail.com
    Home page: N/A
  • Klinefelters Syndrome Support Group of Australia (K.S.S.G)
    38 York Rd
    Kellyville, New South Wales None 2155
    Phone #: 04 -072-62398
    800 #: N/A
    e-mail: YATESBECKS@bigpond.com
    Home page: N/A
  • MUMS (Mothers United for Moral Support, Inc) National Parent-to-Parent Network
    150 Custer Court
    Green Bay WI 54301-1243
    Phone #: 920-336-5333
    800 #: 877-336-5333
    e-mail: mums@netnet.net
    Home page: http://www.netnet.net/mums/
  • Madisons Foundation
    PO Box 241956
    Los Angeles CA 90024
    Phone #: 310-264-0826
    800 #: N/A
    e-mail: getinfo@madisonsfoundation.org
    Home page: http://www.madisonsfoundation.org
  • March of Dimes Birth Defects Foundation
    1275 Mamaroneck Avenue
    White Plains NY 10605
    Phone #: 914-428-7100
    800 #: 888-663-4637
    e-mail: Askus@marchofdimes.com
    Home page: http://www.marchofdimes.com
  • NIH/National Institute of Child Health and Human Development
    31 Center Dr
    Bethesda MD 20892
    Phone #: 301-496-5133
    800 #: --
    e-mail: N/A
    Home page: http://www.nichd.nih.gov/



For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html