Klinefelter's syndrome is a genetic disorder that affects males, occurring when a boy is born with one or more extra X chromosomes, causing lower testosterone levels than normal males. This can result in some unusual physical traits for males as well as infertility. It is diagnosed through a karyotype and can be treated through testosterone therapy starting at puberty to support normal development.

2. W hat is Klinefelter 's Syndrome?
Klinefelter's syndrome is a genetic disorder
that only affects males.
It occurs when a boy is born with one or more
extra X chromosomes, which causes a boy to
produce less
testosterone than a normal boy. .
Due to having an extra X chromosome, the
male may possibly have some physical traits
unusual for males.

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5. How do y ou get Klinef elter ' s Sy ndrome?
An extra X chromosome most often occurs
when the genetic material in the eggs or the
sperm splits unevenly.
It' s a random event during the formation of
reproductive cells
An error in cell division called nondisjunction
results in a reproductive cell with an abnormal
number of
chromosomes.
It ' s diagnosed in adulthood by using a
karyotype.

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8. Treatment of Klinefelter ' s Syndrome
Males with Klinefelter' s Syndrome can be
given testosterone therapy.
If given around the age of puberty, it can
help a boy have normal body development.
A infertility specialist may be able to help a
male with Klinefelter' s syndrome to get a
woman pregnant.

9. History of Klinefelter ' s Syndrome
In 1942, Klinefelter's was discovered by Dr.
Harry Klinefelter, along with other doctors at
General Hospital in Boston.
Doctors
re
ported a group of males with "enlarged breasts,
sparse facial and body hair, small testes,
a
nd inability to produce sperm."
By the late
1
950 's, researc hes discovered that these

10. Lifestyle with Klinefelter ' s
Syndrome
As a Bab Child and Teen:
May sit up, crawl, and walk later than other
infants .
Tend to be taller and have less muscle control
than other boys.
May have language problems
Tend to be quiet and undemanding. Entering
puberty, these males don' t make as much
testosterone.