Klinefelter syndrome: signs, diagnosis and treatment in Tashkent

Other names: Кариотип 47,XXY, синдром 47 XXY, XXY-синдром

Klinefelter syndrome is a genetic condition in which a male has an extra X chromosome (karyotype 47,XXY). This is one of the most common chromosomal features in men and at the same time one of the most lately diagnosed: manifestations are often erased, and a significant part of men find out about their diagnosis only during an examination for infertility - or never find out. Meanwhile, early diagnosis makes it possible to start therapy on time and preserve the possibility of paternity.

🧾 МКБ-10: Q98.0 🏥 Where it is treated: 2 Karyotype 47,XXYOften detected latePaternity is possible

👨‍⚕️ Which doctor

Andrologist, endocrinologist, geneticist

🔬 Diagnostics

Karyotype, FSH, LH, testosterone, ultrasound of the scrotum

💊 Treatment

Replacement therapy, micro-TESE

📈 Prognosis

Favorable when observed

⚠️ At risk

Mother's age during pregnancy

⏱ When to see a doctor

Routine examination

🚨 See a doctor urgently

With these signs do not wait for a scheduled appointment — the condition requires emergency care.

Маленькие плотные яички у взрослого мужчины
Отсутствие или задержка полового созревания у подростка
Азооспермия в спермограмме
Гинекомастия в сочетании с высоким ростом и длинными конечностями
Повышенный ФСГ и ЛГ при низком тестостероне
Остеопороз в молодом возрасте

What is this condition

Normally, the male set of chromosomes is designated as 46,XY. In Klinefelter syndrome, there is an additional X chromosome - 47,XXY. There are also rarer variants with a larger number of additional chromosomes, as well as mosaic forms, in which some of the cells have a normal set.

The additional X chromosome primarily affects the development of the testicles: their tissue is gradually replaced by connective tissue, testosterone production decreases and sperm formation is disrupted. That is why the main manifestations are associated with a lack of male sex hormones and infertility.

Mosaic forms are milder: some men retain spermatogenesis, and they can have children naturally, unaware of their peculiarity.

How it manifests itself

Small, dense testicles are the most consistent symptom.
Tall with relatively long arms and legs
Sparse hair on the face and body
Gynecomastia - enlargement of the mammary glands
Decreased muscle mass and strength
Female pattern fat deposition
Decreased libido, erectile dysfunction
Infertility, most often azoospermia
Fatigue, decreased concentration, decreased mood
Difficulties with speech and learning in childhood for some boys
Decreased bone density
Often - minimal manifestations or their complete absence

Именно вариабельность картины объясняет позднюю диагностику: у многих мужчин единственным заметным признаком оказывается небольшой размер яичек, на который они не обращают внимания. Диагноз нередко ставится в тридцать-сорок лет при обследовании по поводу бесплодия.

Associated risks

Osteoporosis due to long-term testosterone deficiency
Metabolic syndrome, obesity, type 2 diabetes
Cardiovascular diseases
Increased risk of breast cancer compared to other men
Autoimmune diseases
Varicose veins and thrombosis
Anxiety and depressive disorders
Thyroid diseases

These risks are not a verdict, but a list of what makes sense to monitor with regular monitoring. Timely initiation of replacement therapy significantly reduces some of them, primarily those associated with testosterone deficiency.

Diagnostics

Karyotyping - analysis of the chromosome set; the only method to confirm the diagnosis
FSH and LH are characterized by a significant increase
Total and free testosterone - reduced or at the lower limit
Estradiol, prolactin
Spermogram - most often azoospermia
Ultrasound of the scrotum with measurement of testicular volume
Densitometry to assess bone density
Glucose, glycated hemoglobin, lipid profile
Ultrasound of the mammary glands for gynecomastia
Psychological assessment and, if necessary, neuropsychological testing in children

Treatment and observation

Testosterone replacement therapy is the mainstay of treatment for confirmed deficiency; improves muscle mass, bone density, mood, libido and overall well-being
Starting therapy in adolescence for delayed puberty - according to the decision of the endocrinologist
Regular monitoring during therapy: testosterone, hematocrit, PSA, lipids, bone density
Surgical correction of gynecomastia with a pronounced cosmetic defect
Weight control, physical activity, adequate calcium and vitamin D intake
Treatment of associated conditions: diabetes, dyslipidemia, thyroid diseases
Psychological support, if necessary, work with a speech therapist and childhood teacher
Regular observation by an andrologist and endocrinologist for life

Принципиально важный момент для мужчин, планирующих детей: заместительная терапия тестостероном подавляет остаточный сперматогенез. Поэтому вопрос сохранения фертильности — криоконсервацию спермы или получение сперматозоидов — необходимо решить ДО начала терапии, а не после.

Possibility to have children

With mosaic forms, sperm are sometimes found in the ejaculate, and natural conception is possible
In the classical form, azoospermia is most often observed.
Micro-TESE - microsurgical search for areas of spermatogenesis in testicular tissue; in a significant proportion of men with this syndrome, sperm can be found
The obtained spermatozoa are used in the ICSI program
Cryopreservation of the obtained material
For teenagers, the issue of early preservation of material is discussed - the decision is made individually
Genetic counseling for couples before reproductive programs
Donor sperm and adoption are options that are also openly discussed

Where to get examined in Tashkent

The examination includes a hormonal profile, spermogram, ultrasound of the scrotum and karyotyping, and management is carried out jointly by an andrologist, endocrinologist and geneticist.

In Tashkent, andrological examination if this syndrome is suspected is carried out at the UROLOGIC COMPLEX medical center and at the Tashkent Medical Park clinic.

If you or your son have small, dense testicles, scant hair growth and tall stature, this is a good reason to take hormone tests and discuss karyotyping. Early diagnosis really changes both the quality of life and the chances of paternity. Clinic contacts are below.

Services and prices for this diagnosis

Based on official price lists of Tashkent clinics. The exact cost is determined after examination.

🔬 Diagnostics

Первичный приём урологаfrom 200 000 Повторный приём урологаfrom 150 000

Frequently asked questions: Klinefelter syndrome

How to suspect Klinefelter syndrome?+

The most consistent sign is small, dense testicles in an adult male. It may be accompanied by tall stature with long limbs, scanty hair on the face and body, enlarged mammary glands and infertility. The analyzes are characterized by a significant increase in FSH and LH with decreased testosterone. Only karyotyping confirms the diagnosis.

Is it possible to have children?+

Yes, in many cases. In mosaic forms, sperm are sometimes found in the ejaculate. In the classic form with azoospermia, micro-TESE is used - microsurgical search for areas of spermatogenesis in testicular tissue, and in a significant proportion of men sperm can be found for subsequent ICSI. Before this, the couple undergoes genetic counseling.

Why can't you start testosterone before deciding on children?+

Because replacement therapy suppresses the production of pituitary hormones and, along with it, residual spermatogenesis, which is already minimal in this syndrome. If paternity is planned, the issue of obtaining and cryopreserving sperm is decided before starting therapy. After prolonged use, the chances decrease.

Is it inherited?+

In the vast majority of cases, the syndrome occurs accidentally, due to chromosome nondisjunction during the formation of germ cells, and is not inherited from the father. When using reproductive technologies, genetic counseling is carried out, and the risk of transmitting chromosomal disorders to offspring is discussed individually.

Does everyone need testosterone therapy?+

Not for everyone and not always. The decision is made based on hormone levels and the presence of deficiency symptoms. For confirmed deficiencies, therapy significantly improves muscle mass, bone density, mood, libido and overall well-being, and reduces the risk of osteoporosis. It is prescribed and monitored by an endocrinologist together with an andrologist.

Why is the diagnosis made so late?+

Because the manifestations are often erased: many men look and feel normal, and the small size of the testicles is not perceived as a reason for treatment. A significant part of diagnoses are made during an examination for infertility at thirty or forty years of age, and some men never find out about their peculiarity. That is why it is important to pay attention to the volume of the testicles during examinations.

The information on this page is for reference only and does not replace a doctor consultation. Only a qualified specialist can make a diagnosis and prescribe treatment after an in-person examination.

Where it is treated Klinefelter syndrome в Ташкенте

Заподозрить синдром позволяет сочетание малых плотных яичек, повышенных ФСГ и ЛГ и азооспермии, а подтверждает диагноз анализ кариотипа. В Ташкенте такое обследование проводят в медицинском центре UROLOGIC COMPLEX и в clinicsе Tashkent Medical Park, совместно с эндокринологом и генетиком.