Klinefelter Syndrome (KS) is a birth defect in which males are born with at least one extra sex chromosome. In 1942, certain physical characteristics, abnormal in adult males, were first identified by Dr. Harry Finch Klinefelter, Jr. and two colleagues. These characteristics were abnormally small testes and fatty breast tissue. Detailed chromosome studies conducted years later resulted in the discovery that males with these characteristics have an extra sex chromosome
American Association for Klinefelter Syndrome Information and Support (AAKSIS)
AAKSIS (pronounced “access”)
AAKSIS is dedicated to bringing you accurate and current information about Klinefelter Syndrome and is a network for individuals, families, and anyone interesting in learning more about Klinefelter Syndrome.
3796 Ogden Lane
Mundeline, IL 60060
Phone: 888 466-5747
Resources to help you better understand your child and get the support you need to help guide them to maturity and their fullest potential.
P.O. Box 659
Paoli, PA 19301
Phone: 888-999-9428
Email: info@genetic.org
Research Opportunities for Families
Klinefelter Syndrome Information and Support
Living with Klinefelter Syndrome, links to other organizations, support groups and resources.
* Steps for Starting a Support Group
Kleinfelter Syndrome – Genetics Home Reference US National Library of Medicine
Klinefelter Syndrome – National Institute of Health
Kleinfelter Syndrome – Genetic and Rare Disease Information Center
About Klinefelter Syndrome – National Human Genome Research Institute
Fact Sheet last updated on: 3/21/2023
_______________________________________________________________________________________________________
Disclaimer: INDEX is pleased to provide you this information. Please note, this information is not comprehensive, nor is it intended to take the place of professional advice. We encourage you to check other resources of such information. No endorsement by the University of Massachusetts Chan Medical School, DisabilityInfo.org, INDEX, or affiliates, should be inferred. We reserve the right to remove, to modify, or to add any information at any time, for any reason, and without notice.
Any information you may provide to update or further complete this information would be appreciated. Please contact us with comments. We appreciate your help.