Resources for Doctors and Professionals 

Turner syndrome occurs in approximately one out of every 2,000 - 2,500 live female births and characterized by the partial or complete absence of the second X chromosome. It is reported that more than 50% of cases have a 45,X karyotype. Another 20%-35% have mosaic karyotypes. Other karyotypes include those with various structural abnormalities. This condition presents healthcare providers with a challenging array of genetic, developmental, endocrine, cardiovascular, psychosocial, and reproductive issues.