Semenya, 18, has been asked to take a gender verification test to prove that she is a woman, according to The Daily Guardian. Nick Davies, a spokesman for the IAAF, said that the test was requested after a race last month when she ran the fastest 800-meter time (before the games in Berlin) at the African junior championships.
The test, which takes several weeks to produce an outcome, includes several "complex procedures" involving doctors, scientists, gynecologists, and psychologists. Davies said he is not sure whether she would be stripped of her medal if the test results show that Semenya is biologically male.
The teen from Limpopo province had never raced outside of Africa before the IAAF World Championships this year.
On Wednesday, she won the race in 1 minute, 55.45 seconds. Defending champion Janeth Jepkosgei, from Kenya, crossed the finish line 2.45 seconds after. Jenny Meadows, a British runner, came in third.