Caster Semenya. Photo: AP
Preliminary test results have shown that 18-year-old Caster Semenya from South Africa has three times the normal female level of testosterone, according to The Sydney Morning Herald this morning.
The most common such hormonal condition is polycystic ovarian syndrome, which affects between 5 and 10 percent of the population, according to the Polycystic Ovarian Syndrome Association of Australia.
The tests were conducted after Semenya's radically improved race times caused doubts about her gender. Semenya won 800m gold at the World Championships in Athletics in Berlin last week.