Not medical advice. This site is general information only. In an emergency call your local emergency number. For advice about your own health, speak to a doctor, pharmacist or other qualified health professional.

Klinefelter Syndrome

GeneticExtra X chromosome (47,XXY)1942 (described)Chromosomal
TypeGenetic
CauseExtra X chromosome (47,XXY)
First Known1942 (described)
TransmissionChromosomal

About Klinefelter Syndrome

The most common chromosome disorder in males, about 1 in 600, often unnoticed until adulthood. Causes tall stature, reduced testosterone, and infertility. Identified at the chromosome level in 1959. Testosterone therapy helps many features.

Related Diseases