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Caster Semenya, the two‑time Olympic 800‑metre champion, has pledged to fight the International Olympic Committee’s (IOC) newly announced gender‑testing policy that would apply to all female athletes competing in strength, power or endurance events. The South African athlete says the rule "undermines women’s rights" and lacks scientific justification. The IOC unveiled the policy last week, stating that including “androgen‑sensitive XY‑DSD athletes” in the female category "runs fundamentally counter to ensuring fairness, safety and integrity in elite competition." The measure is expected to become a universal requirement across Olympic sports, replacing a patchwork of national regulations that have sparked controversy for years. Semanya, who has been embroiled in a long‑running legal dispute with World Athletics over her right to compete despite having a Difference of Sexual Development (DSD), told Reuters, "We’re going to be vocal about it, we’re going to make noise until we’re heard". She added, "Enough is enough – women will not be told how to compete". DSDs are rare conditions involving variations in genes, hormones and reproductive anatomy. Some individuals with DSDs are raised as female yet possess XY chromosomes and testosterone levels typical of males. The IOC’s testing protocol will involve a cheek‑swab or saliva sample to detect the SRY gene on the Y chromosome, with further investigation for any positive results. Semanya rejected the scientific premise of the rule, stating, "There’s no science that XY‑DSD gives an athlete an advantage". She emphasized that athletic success stems from hard work, not genetics, and criticized those who claim intersex conditions confer a performance edge. She also criticized IOC President Kirsty Coventry, the first woman and first African to hold the position, for failing to consult athletes with DSDs before issuing the policy. "They sent us a letter the day they were going to publish the new policy," Semanya said, urging genuine stakeholder engagement rather than a perfunctory "tick‑the‑box" approach. By labeling the policy as a breach of women’s dignity and rights, Semanya aims to rally broader support for intersex athletes and challenge what she describes as a historically flawed testing regime.

The decision has garnered mixed reactions. The charity Sex Matters has welcomed the guidelines, calling them a necessary measure to secure a safe and fair female category. However, others, such as Dsdfamilies, have expressed concern that the proposed processes may cause harm to transgender and DSD athletes.

The International Olympic Committee (IOC) has made a significant U-turn on its policy regarding transgender athletes, effectively banning them from competing in female events at the Olympics. This decision marks a major shift from their previous stance, which allowed transgender women to compete with certain conditions.In 2020, the IOC permitted Laurel Hubbard, a transgender weightlifter, to compete at the Tokyo Olympics, issuing a framework that stated transgender women “should not be deemed to have an unfair or disproportionate competitive advantage” over biological women. However, in a recent policy document, the IOC has stated that the female category must be protected for fairness and safety reasons, and will use SRY screening – a sex test using saliva or a cheek-swab – to determine biological sex.This new policy means that transgender women and athletes with differences in sex development (DSD), who were reported as female at birth but have internal testes and have undergone male puberty, are now banned from the female category at all future Olympics. The decision has caused anger among some groups and joy among others.According to Kirsty Coventry, the newly elected IOC president, this policy change was a priority for her, and she had set up a working group to examine the issue shortly after taking office. Coventry emphasized that the decision was based on scientific consensus and the need to protect the female category.The IOC's decision is based on scientific research showing that males have a performance advantage in sports, even after hormone treatment. The policy document states that the advantage is 10-12% in most running and swimming events, and greater than 100% in events that involve explosive power. This has led to sports such as athletics, swimming, and boxing introducing policies to protect the female category.While this decision applies only to elite sport, there could still be future challenges at the Court of Arbitration for Sport if transgender or DSD athletes decide to appeal. Nevertheless, the IOC's U-turn marks a seismic shift in the ongoing debate about transgender athletes and their participation in sports.