Testosterone regulations in women's athletics

The testosterone regulations in women's athletics are a series of policies limiting blood testosterone levels for female athletics competitors as a means of sex verification. They were first published in 2011 by the IAAF (now World Athletics) and last updated following a court victory against the athlete Caster Semenya in May 2019. The first version of the rules applied to all women with high testosterone, but the current version of the rules only applies to athletes with certain XY disorders of sexual development.

Specifically, they set a limit of 5 nmol/L testosterone, which applies only to distances between 400 m and 1 mile (inclusive), other events being unrestricted. Athletes are allowed to compete in the restricted events with medical suppression of testosterone (by contraceptive injections or pills, or physical castration), although in practice many have chosen to switch to unaffected events, most notably the 200 m.

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