IOC Bans Transgender Athletes From Women's Events

The International Olympic Committee has banned transgender women from competing in women's events at the 2028 Los Angeles Olympics and all future Games. The decision, announced Thursday by IOC President Kirsty Coventry, also bars most athletes with differences of sex development (DSD) from the women's category.

Every athlete entering a women's event will now undergo a one-time genetic test — a cheek swab or saliva sample — screening for the SRY gene, which triggers male sex development. Test positive, and you're out of women's competition permanently.

"Even the smallest margins can be the difference between victory and defeat," Coventry said. "It would not be fair for biological males to compete in the female category."

The policy aligns directly with President Trump's executive order banning transgender athletes from women's sports in the United States. The 2028 Olympics will be held on American soil.

The Test They Swore They'd Never Use Again

What makes this decision remarkable isn't just the ban. It's the return of mandatory sex testing — a practice the IOC spent decades trying to bury.

The IOC first introduced chromosomal testing at the 1968 Mexico City Olympics, responding to Cold War suspicions that Soviet and Eastern Bloc teams were fielding male athletes in women's events. The tests never caught a single man disguised as a woman. What they did catch were women with natural genetic variations who had no idea they carried unusual chromosomal patterns.

Polish sprinter Ewa Kłobukowska was the first high-profile casualty. In 1967, she failed a chromosomal test despite having competed as a woman her entire life — and having previously passed a physical examination. She was publicly branded a "male imposter," stripped of her medals, and banned at age 21. She later gave birth to a child. The tests were wrong.

The pattern repeated across decades. Athletes born female, raised female, competing as female — flagged by a genetic test that couldn't account for the messy reality of human biology. The IOC abolished routine sex testing in 1999, admitting the science was inadequate and the harm was real.

Now they've brought it back, using a different marker. The IOC says the SRY gene test is "the most accurate and least intrusive method currently available." A group of academics, in a report submitted this month to the British Journal of Sports Medicine, called sex testing "a backwards step and a harmful anachronism."

Who's Actually Affected

The number of transgender women competing at the Olympics has been vanishingly small. Only one openly transgender woman — New Zealand weightlifter Laurel Hubbard — has competed, at the 2020 Tokyo Games, where she finished last. The practical impact on transgender athletes at the elite level is minimal.

The bigger impact falls on athletes with DSD — people born with variations in chromosomes, hormones, or reproductive anatomy that don't fit typical male or female categories. The IOC's own 10-page policy document states that athletes with DSD "retain the advantages of going through male puberty."

This directly affects athletes like Algerian boxer Imane Khelif and Taiwanese boxer Lin Yu-ting, who won gold medals at the 2024 Paris Olympics amid fierce public debate about their eligibility. Both were assigned female at birth and identify as women. Both faced relentless online scrutiny and misinformation during the Paris Games.

Khelif later told CNN the controversy "caused me psychological trauma, for me, and for my family." She said she would accept testing to compete in 2028. Under the new policy, her eligibility depends entirely on whether she carries the SRY gene — a question no one has publicly answered.

The Framing War

Read this story from US media and it's a victory for fairness. Fox News leads with "IOC bans biological males." NBC frames the policy as "aligning with Trump's executive order." The headline-level message: women's sports have been protected.

Read it from European outlets and the tone shifts. The BBC leads with the return of sex testing and its troubled history. The Guardian quotes human rights experts and highlights the DSD impact. Inside the Games notes that "precedents of sex testing in sports have not been kind to those portraying it as unharmful."

Read it from the Global South and different names surface. In South Africa, Caster Semenya's story is inescapable. The two-time Olympic 800m champion was subjected to sex verification testing in 2009, forced to undergo humiliating medical examinations, and eventually barred from her event by World Athletics' testosterone rules. She fought the ban all the way to the European Court of Human Rights and lost.

Indian media focuses on Dutee Chand, who was suspended in 2014 under a testosterone policy but won her appeal at the Court of Arbitration for Sport — temporarily overturning sex testing in track and field. These aren't abstract policy debates in Delhi or Pretoria. They're stories of specific women whose careers and dignity were altered by the kind of test the IOC just reinstated.

The Political Context

The IOC's decision doesn't exist in a vacuum. It arrives during a specific political moment.

Trump signed an executive order on women's sports early in his second term, and publicly stated he would not allow transgender athletes to compete at the Los Angeles Games. With the Olympics coming to US soil, the IOC faced a direct collision between its institutional policies and the laws of the host country.

The new president of the IOC, Kirsty Coventry — a former Zimbabwean swimmer and the first woman to lead the organization — made the announcement herself. She framed it purely as a scientific and fairness question.

But at least 30 national sports federations in track and field, swimming, cycling, rugby, and boxing had already adopted their own transgender bans before the IOC moved. World Athletics, the governing body of track and field, required genetic testing starting in 2023. World Aquatics banned anyone who went through male puberty from women's events.

The IOC was, in many ways, the last major holdout. Its 2021 framework had avoided setting specific eligibility rules, leaving decisions to individual sports federations. That approach collapsed under the weight of Paris 2024's controversies and growing political pressure.

What the Science Says (and Doesn't)

The IOC argues its position is evidence-based. Its 10-page policy document cites research showing that male puberty produces physical advantages — in bone density, muscle mass, lung capacity, and heart size — that are not fully reversed by hormone therapy.

This is broadly supported by the scientific literature. Where the science gets complicated is at the margins — specifically, in cases of DSD where individuals may have the SRY gene but experienced atypical development. A person can carry the SRY gene and still develop predominantly female anatomy, depending on how their body responds to hormones.

The IOC acknowledges this by including an appeals process. Athletes who test positive for the SRY gene can apply for an exemption by demonstrating that they did not experience "the physical development associated with male puberty." How that standard will be applied in practice remains unclear.

The test is a binary gate — positive or negative — applied to biology that isn't always binary. The IOC is betting that the SRY gene is a clean enough line to draw. Critics say they tried clean lines before, and the results were anything but clean.

What Comes Next

The policy will be challenged. AP News reports it "can — and likely will" face appeals at the Court of Arbitration for Sport. Human rights organizations that opposed sex testing when it was abolished in the 1990s are already signaling opposition to its return.

The 2028 Los Angeles Olympics will be the first Games under these rules. Fewer eligibility disputes may occur at the venues. More will occur in courtrooms.

For the athletes caught in the middle — the women with DSD conditions, the athletes from countries where gender verification carries social consequences far beyond sport — the policy means submitting to genetic screening and hoping the test sees them clearly enough.

History suggests it doesn't always.