On March 26, 2026 the International Olympic Committee (IOC) published a policy that changes who may compete in the female category at the Olympic Games. The ruling states that eligibility for any women’s event at an IOC-organized competition will be determined by the presence or absence of the SRY gene, a chromosomal marker linked to male development. The document says the test will be carried out only once in an athlete’s life and will be required for participation beginning at LA28 (the Los Angeles 2028 Olympic Games).
This announcement, delivered under the leadership of Kirsty Coventry—the first woman elected to the IOC presidency in June 2026—replaces the post-2026 approach that left access rules to individual sports federations. According to the IOC, the review that informed this decision drew on scientific, medical and legal material collected between September 2026 and March 2026. The stated aim is to protect what the body calls the integrity, safety and fairness of women’s sport.
What the new rule requires
The core practical change is the mandatory detection of the SRY gene to verify biological sex. The IOC describes the screening as “non-intrusive,” to be performed by saliva, buccal or blood sampling, and organized by international and national sporting bodies. Athletes who test positive for the SRY marker will be ineligible for female-category competition at IOC events, unless they qualify under a narrow medical exception. The policy explicitly excludes transgender women from female events under IOC-organized competitions.
SRY testing procedure and legal considerations
Testing is designed as a one-time procedure and is intended to be implemented by federations and national Olympic committees. However, the measure collides with domestic legal regimes: for example, several countries have restrictions or prohibitions on genetic testing outside clinical contexts. The IOC states that athletes from states where such tests are illegal may travel to jurisdictions where testing is permitted to complete the requirement. The organization frames the process as a harmonized method to determine eligibility across sports.
Who is affected and what exceptions exist
The policy directly impacts transgender women by barring their participation in female categories at IOC events. It also affects many athletes with intersex variations, although the IOC allows limited exceptions. Individuals diagnosed with complete androgen insensitivity syndrome (CAIS) or other rare disorders of sex development may still be eligible if clinical evidence demonstrates they do not gain androgen-driven performance benefits. Such assessments can be medically complex and may require specialized, costly testing and documentation.
Historical context and precedents
The return to chromosomal screening recalls earlier IOC practices: from 1968 to 1996 chromosomes were used to police eligibility, a program later discontinued after controversies at the 1996 Atlanta Games when several athletes were disqualified and subsequently reinstated. In recent years some international federations—athletics, boxing and skiing among them—had already introduced similar rules for events they govern. The IOC’s new framework replaces prior guidance, including the 2026 stance that delegated responsibility to federations.
Implementation challenges and reactions
Critics raise ethical, scientific and legal questions. Many scientists argue there is no consensus that the sole presence of the SRY gene equates to an unequivocal competitive advantage across all sports. Bioethicists and some national Olympic committees, including voices in countries with strict bioethics laws, have flagged concerns about privacy, discrimination and the feasibility of cross-border testing. The IOC counters that protecting a level playing field—where even marginal physiological differences can affect medal outcomes—justifies the policy.
Practically, the rule forces federations, national committees and athletes to prepare for new administrative and medical workflows before LA28. Athletes who test positive for SRY are offered two alternatives by the IOC: compete in male categories or enter sports that do not separate competitors by sex—an option at the Summer Games limited essentially to equestrian events. The debate is likely to continue as sports organizations, legal systems and athlete groups respond to a policy that reshapes eligibility standards for the highest level of competition.