Klinefelter syndrome: Introduction
A rare chromosomal genetic syndrome where the person
has XXY chromosomes instead of XY or XX.
The person is usually male because of the Y chromosome,
but has lower levels of testosterone
and may have some female-like features
(because there are two X chromosomes).
Sterility is a possible complication.
The rarer subtype XXXY syndrome may lead to retardation. ...more »
Symptoms of Klinefelter syndrome
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symptoms of Klinefelter syndrome
Treatments for Klinefelter syndrome
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Home Diagnostic Testing
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Wrongly Diagnosed with Klinefelter syndrome?
Klinefelter syndrome: Related Patient Stories
Types of Klinefelter syndrome
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Diagnostic Tests for Klinefelter syndrome
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diagnostic tests for Klinefelter syndrome
Klinefelter syndrome: Complications
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Causes of Klinefelter syndrome
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Disease Topics Related To Klinefelter syndrome
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Klinefelter syndrome: Undiagnosed Conditions
Commonly undiagnosed diseases in related medical categories:
Misdiagnosis and Klinefelter syndrome
Misdiagnosed weight-related causes of infertility: A woman's weight status
can affect her level of fertility.
Although obesity or overweight can in themselves reduce fertility,...read more »
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Klinefelter syndrome: Research Doctors & Specialists
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Klinefelter syndrome: Rare Types
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Evidence Based Medicine Research for Klinefelter syndrome
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Klinefelter syndrome: Animations
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Research about Klinefelter syndrome
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Clinical Trials for Klinefelter syndrome
The US based website ClinicalTrials.gov lists information on both federally
and privately supported clinical trials using human volunteers.
Some of the clinical trials listed on ClinicalTrials.gov for Klinefelter syndrome include:
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Statistics for Klinefelter syndrome
Klinefelter syndrome: Broader Related Topics
Types of Klinefelter syndrome
Klinefelter syndrome Message Boards
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Definitions of Klinefelter syndrome:
A common sex chromosomal anomaly in males characterized mainly by small testes with tubular hyalinization, azospermia with infertility, slight breast enlargement, elevated urinary gonadotropins, and decreased urinary 17-ketosteroids. Dull mentality has been noted. The affected individuals appear normal after birth, except for small testes. Most characteristic features become evident at adolescence as hypogonadism, gynecomastia, incomplete virilization with variable eunuchoidism, and dull mentality. Without testosterone therapy, most adult patients may become obese. Occasional abnormalities may include cryptorchidism, hypospadias, ataxia, scoliosis during adolescence, and diabetes mellitus in adulthood.
- (Source - Diseases Database)
Syndrome in males that is characterized by small testes and long legs and enlarged breasts and reduced sperm production and mental retardation; a genetic defect in which an extra X chromosome (XXY) is present in the male
- (Source - WordNet 2.1)
Ophanet, a consortium of European partners,
currently defines a condition rare when it affects 1 person per 2,000.
They list Klinefelter syndrome as a "rare disease".
Source - Orphanet
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