LOS ANGELES, MARCH 27, 2026 —
Two years before the world’s athletes gather in Los Angeles for the 2028 Summer Olympics, the International Olympic Committee made the most consequential eligibility decision in its 132-year history. Every woman who wants to compete in a women’s event at the Olympics must now undergo a genetic test. Those who test positive for the SRY gene — a genetic marker associated with male sex development — will be barred from competing, with narrow medical exceptions.
The IOC announced the policy Thursday after a yearslong review, reversing its 2021 Framework on Fairness, Inclusion and Non-Discrimination that had taken a case-by-case approach to transgender athlete participation. The new policy is blunt: “Eligibility for any female category event at the Olympic Games or any other IOC event, including individual and team sports, is now limited to biological females.”
IOC President Kirsty Coventry, a former Olympic swimmer from Zimbabwe who won four Olympic medals across three Games, delivered the announcement in a live-streamed statement from Lausanne, Switzerland. “At the Olympic Games, even the smallest margins can be the difference between victory and defeat,” she said. “So, it is absolutely clear that it would not be fair for biological males to compete in the female category.”
What the Test Actually Is — And What It Measures
The policy hinges on a one-time genetic screening for the SRY gene — the Sex-determining Region Y gene, first identified in 1990. The IOC describes the SRY gene as representing “highly accurate evidence that an athlete has experienced male sex development.” Athletes who test positive will be barred from women’s events. Athletes who test negative will be cleared for life — the test is required only once per career.
The IOC has outlined rare exceptions. Athletes who test positive but have a diagnosis of Complete Androgen Insensitivity Syndrome — a condition in which the body cannot respond to testosterone despite having the SRY gene — may still be eligible. Other rare disorders in sex development may also qualify for case-by-case exceptions. The committee has not yet explained how athletes will access those exceptions or appeal a positive result.
The test itself costs approximately $250. Who bears that cost — the athlete, their national Olympic committee, or the IOC — has not been determined.
The Science That Is Contested
The IOC’s decision to anchor its eligibility policy on the SRY gene rests on a scientific assumption that a significant number of researchers dispute. The gene’s discoverer himself — Andrew Sinclair, who identified the SRY gene in 1990 — has publicly opposed using the test to determine biological sex. In an op-ed published last year, he was explicit: “All it tells you is whether or not the gene is present.”
The distinction matters because presence of the SRY gene does not guarantee typical male athletic development. Athletes with certain chromosomal conditions test positive for SRY but cannot respond to testosterone — meaning they would have no performance advantage over female competitors with typical chromosomes. Some of those athletes are women who have competed at international level for their entire careers without knowing they carried the gene.
Several European countries — including France and Norway — have existing laws banning genetic testing for purposes other than medicine or research. Athletes from those countries will face a particular logistical challenge: they will need to travel abroad to undergo testing that is illegal to conduct on their home soil.
How Many Athletes Does This Actually Affect?
The honest answer is: very few. No woman who transitioned from being born male is known to have competed at any Olympic Games since Tokyo 2021, when New Zealand weightlifter Laurel Hubbard competed without winning a medal. No openly transgender women are known to be competing at an Olympic level in any sport today.
The policy is, in practice, a statement of principle more than a response to a documented competitive problem. The IOC acknowledged as much, noting the rule “is not retroactive and does not apply to any grassroots or recreational sports programs.” Its scope is limited entirely to Olympic competition.
Trump’s Role — And the U.S. Connection
The new IOC policy aligns directly with an executive order President Trump signed in January 2026 directing U.S. sports organizations to maintain sex-based eligibility standards in women’s events. The Los Angeles 2028 Games take place on American soil — making the IOC’s accommodation of the U.S. political position more than coincidental, according to multiple sports policy analysts.
Trump said Thursday that athletes at the 2028 Games would face genetic testing, framing the IOC announcement as a victory: “We’re doing the right thing.”
The Critics — And Why They Are Not Finished
More than 90 organizations — including the International Commission of Jurists and the Sport and Rights Alliance — had urged the IOC not to adopt the policy, calling mandatory genetic testing a “catastrophic erosion of women’s rights and safety.” Olympic medalist Francine Niyonsaba, who has herself faced sex-testing disputes in international competition, called on the IOC not to “turn its back on women and girls of color” — noting that sex-testing policies have historically fallen most heavily on women from the Global South.
Legal challenges are expected. Human rights organizations have pledged to scrutinize the implementation closely, particularly the exception process and its accessibility to athletes from countries with different legal and medical infrastructures.
The 2028 Los Angeles Games are 839 days away. The IOC has set the rules. The lawsuits are coming. And the debate that has consumed women’s sports for the better part of a decade has just found its biggest stage yet.
