What is Klinefelter syndrome? - Prof Rob McLachlan
When a Child or Teen has Klinefelter Syndrome - Dr. Mark Daniels
WHAT is Klinefelter Syndrome?
Instituto Bernabeu's specialised unit for the treatment of Klinefelter's Syndrome and fertility
Klinefelter syndrome (KS) also known as 47,XXY or XXY, is the set of symptoms that result from two or more X chromosomes in males. The primary features are infertility and small testicles. Often, symptoms may be subtle and many people do not realize they are affected. Sometimes, symptoms are more prominent and may include weaker muscles, greater height, poor coordination, less body hair, breast growth, and less interest in sex. Often it is only at puberty that these symptoms are noticed. Intelligence is usually normal; however, reading difficulties and problems with speech are more common. Symptoms are typically more severe if three or more X chromosomes are present.