In a decision already being described as a defining moment for modern sport, the International Olympic Committee has announced a new policy to protect the integrity of the female category, setting clear, science based eligibility rules for Olympic competition from the Los Angeles 2028 Games onwards.
Approved by the IOC Executive Board on 26 March 2026, the policy marks a decisive shift toward sex based classification in elite sport, following years of debate, controversy, and growing concern from female athletes and governing bodies worldwide.
At its core, the new framework limits eligibility for women’s events at Olympic Games and IOC competitions to biological females, determined through a one time screening for the presence or absence of the SRY gene, a genetic marker associated with male sex development.
A Clear, Science Led Standard
The IOC says the policy is grounded in extensive scientific evidence and expert consultation. The SRY gene, typically found on the Y chromosome, plays a crucial role in initiating male development in utero. Its presence, the IOC concludes, provides a highly accurate and stable indicator of biological sex.
Testing will be conducted through minimally intrusive methods such as saliva, cheek swab, or blood sample, and in most cases will only be required once in an athlete’s lifetime.
Athletes who test negative will be eligible for the female category permanently. Those who test positive will not be eligible for women’s events, with the exception of rare conditions such as Complete Androgen Insensitivity Syndrome, where individuals do not benefit from testosterone driven performance advantages.
Importantly, the policy is not retroactive and will not affect past Olympic results or participation, nor will it apply to grassroots or recreational sport.
Fairness and Safety at the Forefront
The decision follows a comprehensive IOC review conducted between September 2024 and March 2026, including input from scientists, medical professionals, legal experts, and more than 1,100 athletes worldwide.
The findings were unequivocal, male physiology confers significant performance advantages in sports involving strength, power, and endurance. These advantages, the IOC noted, persist even after testosterone suppression.
In measurable terms, the working group found male performance advantages of around 10 to 12 per cent in endurance sports such as running and swimming, rising to over 20 per cent in jumping and throwing events, and exceeding 100 per cent in some combat and collision sports.
Such differences, the IOC concluded, raise not only fairness concerns but also safety risks, particularly in contact sports.
IOC President Kirsty Coventry emphasised the importance of these findings, stating that the new rules ensure that “even the smallest margins, which can decide Olympic victory, are protected by a fair and level playing field.”
She added that while inclusion remains important, “it would not be fair for biological males to compete in the female category, and in some sports it would simply not be safe.”
Strong Support from Athletes and Advocates
The announcement has been welcomed by prominent voices who have long campaigned for clearer protections in women’s sport.
Author JK Rowling described the decision as “a welcome return to fair sport for women and girls,” adding that it marked a long overdue correction after years of controversy.
Olympian Sharron Davies, a consistent advocate for female athletes, called on sporting bodies to act swiftly in adopting similar standards. She argued that the female category exists precisely to ensure fairness and safety, and warned that failing to protect it risks discouraging participation among women and girls.
Davies also highlighted the real world consequences of previous policies, noting that female athletes have lost medals, opportunities, and, in some cases, their sense of safety in competition and training environments.
Her message was clear, protecting sex based categories is not exclusionary, but essential to preserving meaningful competition.
Inclusion, Without Compromising Integrity
While firm in its stance on the female category, the IOC has emphasised that all athletes will continue to have opportunities to compete.
Athletes who are not eligible for the women’s category may compete in male categories, mixed events, or open classifications where applicable. The policy also stresses that eligibility rules do not question an athlete’s gender identity or legal status, but are strictly about maintaining fairness in elite competition.
In parallel, the IOC is urging international federations and national governing bodies to implement the policy with care, ensuring education, privacy protections, and access to counselling and medical support.
A Defining Moment for Women’s Sport
The introduction of this policy reflects a broader recognition within the Olympic Movement, that without clear, consistent rules grounded in biological reality, the very purpose of the female category is undermined.
By reaffirming that category’s basis in sex, the IOC aims to secure equal opportunity, protect athlete welfare, and preserve the integrity of competition at the highest level.
As preparations begin for LA28, the message from Lausanne is unmistakable, the era of ambiguity is over, and women’s sport, long at the centre of this debate, now has a framework designed to protect it for generations to come.
