NPR

IAAF Sets New Limits On Testosterone Levels In Women

Track and field's world governing body announced new restrictions on female athletes who naturally produce higher-than-normal levels of testosterone.
Caster Semenya of South Africa crosses the line to win gold in the Women's 800 meters during athletics on Day 9 of the Gold Coast 2018 Commonwealth Games in Australia.

What exactly makes a woman?

Track and field's world governing body thinks the answer has to do with levels of serum testosterone, at least when it comes to female runners competing in middle-distance races.

The International Association of Athletics Federation announced a new set of rules Thursday that will ban women who naturally produce higher-than-normal levels of testosterone from participating in races ranging from 400 meters to the mile, unless they agree to take medication.

Athletes with the condition, called hyperandrogenism, would be eligible to compete at

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