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Press Release

IAAF response to a media report

The IAAF has responded to a news report published today, and later amended, in The Times of London.

"The IAAF is not classifying any DSD (Differences of Sexual Development) athlete as male. To the contrary, we accept their legal sex without question, and permit them to compete in the female category. However if a DSD athlete has testes and male levels of testosterone, they get the same increases in bone and muscle size and strength and increases in haemoglobin that a male gets when they go through puberty, which is what gives men such a performance advantage over women. Therefore, to preserve fair competition in the female category, it is necessary to require DSD athletes to reduce their testosterone down to female levels before they compete at international level."

IAAF