Read about 47 xxy syndrome medical facts: what is the definition of 47 xxy syndrome, what are the signs and symptoms, medical treatment & how to treat 47 xxy syndrome, diagnosis, frequency, complications, and related 47 xxy syndrome diseases.

Definition: What is "47 XXY Syndrome"?


47 XXY syndrome is popularly known as the Klinefelter's syndrome, or simply, the XXY syndrome. Chromosome aneuploidy causes the occurrence of this condition. The male patients develop an extra X chromosome. Typically, males should have one each of the X & the Y chromosomes. Patients who suffer from this condition have smaller testicles when compared to their normal male counterparts & thus, they acquire problems on infertility. There are very few symptoms to this syndrome & the cases vary among boys & men. The term for this illness was named after an endocrinologist, Harry Klinefelter. 1942 was the year when he first described the XXY syndrome. The patients who suffer with XXY syndrome are called XXY males or 47,XXY males.

Symptoms & Signs

More often than not, the patients become sterile when they become XXY males. There is a slight chance, though, that reproductive aid may be given. There are also reported cases of impairment in learning verbal skills & this is often diagnosed when neuropsychological tests are done. Some males who are afflicted with this condition could also develop the so-called 'man boobs' or enlarged male breasts. About 10% of the known cases of gynecomastia would need surgery. Hypogonadism could also result once the extra X gene is acquired. This means that the patient would have testicles that malfunction. The most severe cases could even develop tumors & cancer cells where the male patients suffer from breast cancer.

Treatment: How to Treat "47 XXY Syndrome"?

Testosterone treatment could not alter the genetic abnormality but it can help in treating some of the symptoms. It is also advisable that boys or men with this condition undergo psychosocial therapy where they would have a support group that would understand & not condemn them.


To confirm diagnoses of XXY syndrome, karyotypes are often used. This means that blood sample is drawn from the patient (only a small quantity is taken) then the white blood corpuscles are separated. These white blood particles are then mixed with tissue culture medium. The next step is to incubate the mixture & then to observe for an extra X chromosome.


Approximately 1 in every 500 to 1,000 males suffers from this syndrome.


Patients with XXY syndrome have higher tendencies of acquiring germ cell tumors. They have about 50% more chance of getting these tumors than normal males. These tumors, though, do not often grow on the testicular region.

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