6 doctors weighed in:

What sex is someone with klinefelters?

6 doctors weighed in
Dr. Henry Ng
Internal Medicine & Pediatrics
4 doctors agree

In brief: Genetic male

A person with kleinfelter's syndrome has three sex chromosomes, XXY instead of the typical two, xy.
The presence of the y chromosome makes them a genetic male.

In brief: Genetic male

A person with kleinfelter's syndrome has three sex chromosomes, XXY instead of the typical two, xy.
The presence of the y chromosome makes them a genetic male.
Dr. Henry Ng
Dr. Henry Ng
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1 comment
Dr. Martin Raff
There are many variances within the XXY population, just as within the 46,XY population. While it is possible to characterise XXY males with certain body types and physical characteristics, that in itself should not be the method of identification as to whether or not someone has XXY. The only reliable method of identification is karyotype testing. The degree to which XXY males are affected, both physically and developmentally, differs widely from person to person.
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