This follows a report by the Daily Telegraph in Australia which claimed that Semenya's gender test results showed that she has no womb or ovaries.
Her coach, Michael Seme, said he was now uncertain whether Semenya would compete at the 4000m women's event at the South African national cross-country championships in Pretoria on Saturday.
The IAAF declined to confirm a Sydney Morning Herald report that world 800m champion Caster Semenya has male and female sex organs.
IAAF spokesperson Nick Davies says the group has received the results of Semenya's gender tests, but he would not discuss the findings.
"I simply haven't seen the results," Davies wrote in an e-mail to The Associated Press. "We have received the results from Germany, but they now need to be examined by a group of experts and we will not be in a position to speak to the athlete about them for at least a few weeks.
"After that, depending on the results, we will meet privately with the athlete to discuss further action."
Semenya's father, Jacob, was angry when contacted by the AP on Friday morning, saying people who say his daughter is not a woman "are sick. They are crazy. Are they God?"
He said he had not been told anything about this from the IAAF, Athletics South Africa or his daughter.
"I know nothing."