Here is a complete explanation of what Klinefelter is, from the causes, signs or symptoms, to how to treat it.

Klinefelter syndrome is a genetic condition in which a boy is born with an extra X chromosome. Instead of the typical XY chromosomes in men, they have XXY, so this condition is also called XXY ...

Klinefelter syndrome is a genetic disorder that affects the development of the testes and, as a result, testosterone production. It is also known as XXY syndrome and was previously sometimes ...

might be suffering from a genetic disorder known as Klinefelter syndrome. Klinefelter syndrome, also known as XXY, is caused by a redundant X chromosome in males. Whereas women normally have two X ...

A genetic evaluation demonstrated Klinefelter syndrome 47, XXY karyotype with concurrent duplication of 3p21.31 by microarray analysis. Maternal genetic analysis demonstrated the same 3p21.31 ...

41 Incidence of 47,XXY increases from 0.4 per 1000 live births at maternal age 33 to 1.7 per 1000 at maternal age 40. 1 Although Down syndrome is the disorder usually sought, 47,XXY may be ...