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Klinefelter syndrome is a genetic condition affecting males, caused by the presence of an extra X chromosome (47, XXY instead of the typical 46, XY). This chromosomal variation interferes with normal male sexual development and can impact physical, hormonal, and cognitive functions.

One of the primary features is hypogonadism, where the testes produce lower levels of testosterone. This may result in delayed or incomplete puberty, reduced facial and body hair, decreased muscle mass, and infertility due to impaired sperm production. Individuals often have taller-than-average height with longer limbs and may develop gynecomastia (breast tissue enlargement).

Learning difficulties, particularly in language and communication skills, can occur, although intelligence is usually within the normal range. Emotional and social challenges, such as low confidence or difficulty with social interactions, may also be present.

Diagnosis is typically made through karyotype testing, often during adolescence or adulthood when symptoms become more noticeable. Hormonal evaluation may also support the diagnosis.

Management includes testosterone replacement therapy to improve secondary sexual characteristics, bone density, and overall well-being. Fertility treatments and educational support can further enhance quality of life and functional outcomes.