Patient Resources from the Klinefelter Syndrome Clinic at MGfC and Mass General

Patient Education and Resources

Klinefelter syndrome is a genetic condition in which boys are born with an extra copy of the X chromosome (XXY). This condition may lead to various medical problems, which may include small testes, infertility, and learning and mental health challenges. However, not everyone experiences the same problems. Most people with Klinefelter syndrome lead healthy lives with proper medical care and education.

About Klinefelter Syndrome

• Klinefelter Syndrome: What You Need to Know
• Resources to Learn About Klinefelter Syndrome

Appointment Information

• How to Keep in Touch With Your Care Team

Organizations and Websites

• The Association for X and Y Chromosome Variations (AXYS): AXYS is an advocacy, education and support organization for individuals with X and Y chromosome variations and their families.
• Living with XXY is a non-profit organization changing the way the world views Klinefelter syndrome (47,XXY), focusing on community, awareness and positive traits.
• National Human Genome Research Institute: Klinefelter Syndrome
• The Hormone Foundation: Klinefelter Syndrome
• Genetic and Rare Diseases (GARD) Information Center: Klinefelter Syndrome