It pays to be informed.

In a move critics call “policing femininity,” recent rule changes by the International Association of Athletics Federations (IAAF), the governing body of track and field, state that for a woman to compete, her testosterone must not exceed the male threshold.

If it does, she must have surgery or receive hormone therapy prescribed by an expert IAAF medical panel and submit to regular monitoring. So far, at least a handful of athletes — the figure is confidential — have been prescribed treatment, but their numbers could increase. Last month, the International Olympic Committee began the approval process to adopt similar rules for the Games.

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