Klinefelter Syndrome (XXY): Symptoms, Diagnosis, and Management

Genetics

Male with extra X chromosome (47,XXY). Most common sex‑chromosome disorder (~1/600 male births).

Common Features

• Tall stature, long limbs
• Small, firm testes
• Low testosterone, infertility
• Gynecomastia
• Learning/language delays, social challenges

Management

• Testosterone replacement (puberty onward)
• Speech, occupational, physical therapy
• Educational support
• Counseling for psychosocial issues
• Fertility options (TESE, IVF with ICSI) in adulthood

Outlook

With early intervention, most lead full, healthy lives.