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What is the prevalence of Klinefelter Syndrome?

How many people does Klinefelter Syndrome affect? Does it have the same prevalence in men and women? And in the different countries?

Prevalence of Klinefelter Syndrome

Klinefelter Syndrome is a genetic disorder that affects males, resulting in the presence of an extra X chromosome. It is estimated to occur in approximately 1 in 500 to 1 in 1,000 live male births. This makes it one of the most common chromosomal disorders in males. The prevalence may vary across different populations and is often associated with advanced maternal age. Klinefelter Syndrome can lead to various physical, developmental, and hormonal challenges, but with early diagnosis and appropriate management, individuals with this condition can lead fulfilling lives.

Klinefelter Syndrome is a genetic disorder that affects males, typically resulting in the presence of an extra X chromosome (XXY) instead of the usual XY configuration. It is one of the most common chromosomal disorders, with a prevalence of approximately 1 in 500 to 1 in 1,000 male births. However, it is important to note that many individuals with Klinefelter Syndrome may go undiagnosed due to mild or atypical symptoms.


The prevalence of Klinefelter Syndrome varies across different populations and is influenced by factors such as maternal age. Advanced maternal age has been associated with a higher risk of having a child with this condition. Additionally, the prevalence may differ depending on the diagnostic methods used and the criteria for diagnosis.


While Klinefelter Syndrome is a relatively common genetic disorder, it is crucial to raise awareness about it to ensure early detection and appropriate medical interventions. Early diagnosis and management can help individuals with Klinefelter Syndrome lead fulfilling lives and mitigate potential physical, cognitive, and psychosocial challenges associated with the condition.


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3 answers
1 in 500 seems to be the most used. Some studies say 1 in 1000. It only affects male as the Y chromosome is what makes one a male. Though I have read that some only have a very small piece of the Y present giving the newborn the appearance of female genitalia, though considered very rare. Research indicates only about 20% of males with KS are diagnosed though this should change with the availability of DNA tests.

Posted Aug 18, 2017 by Stephen 2000
it is said 1 in every 500 boys develop it

Posted Mar 4, 2018 by Adrian 1600

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The medical community is getting away from putting labels on us as men with Klinefelter Syndrome. Some of us identify ourselves with being men, women, Trans or Intersex, We no longer want to be placed into boxes so we are getting away from labels ...
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Hello I live in Perth wa I was diagnosed with klinefelters, in 2008 after trying to have a baby with my girlfriend. We went to a ivf clinic called pivot. It was a devastating blow to my self esteem. I have been receiving testosterone treatment for 6 ...
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We discovered our beautiful Son, Nephew, Grandson and Friend had Klinefelter Syndrome on the 30th November 2015.  I will make this my lifelong committment to learn and educate through scientific research , Journal articles, Conferences, and person...
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PREMARIN(0.625mg*2)+Male. E2=60-80pg/mL. From 6 years ago. Gynecomastia. Disease discovered is 10 years ago. Since the Japanese seldom are taking PREMARIN, it is just like human experimentation.  

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Klinefelter Syndrome forum

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Klinefelter Syndrome forum
Hello my Name is Diana and I am in a relationship with someone who has Kleinfelter's.   Sometimes I feel like my boyfriend is going down a path in his head where I can't follow. At these times everything I do or say is bad and I am the awf...

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