The World Olympic Committee introduced a brand new coverage on March 26, 2026, for ladies’s competitions: Each and every athlete will have to be examined for a gene referred to as SRY, normally discovered at the Y chromosome. Men usually have a Y chromosome and women folk usually don’t, so the IOC says this requirement will exclude “biological males.” This announcement comes as making plans for the 2028 Summer time Olympics, hosted in Los Angeles, is underway.
However the IOC commentary hides the complexity of organic intercourse and continues the group’s century of what the report presentations is inconsistent and biologically unsound sports activities insurance policies.
I’m a biology professor and writer of an upcoming e-book, “The Binary Delusion: How Biology Defies the Myth of Two Sexes.” Whilst the impetus for the brand new coverage appears to be exclusion of transgender ladies from ladies’s athletics, it is going to much more likely exclude and draw unwelcome exposure to many extra ladies who don’t seem to be transgender.
Few elite athletes are transgender
Transgender other people have confronted mounting prison and political assaults in recent times.
President Donald Trump issued an government order on Jan. 20, 2025, saying that organic intercourse is discreet and binary – that everybody is unambiguously feminine or male – and some other government order precluding “males” from ladies’s competitions.
A minimum of 29 U.S. states have excluded transgender women and girls from woman’s and girls’s athletic competitions. Those regulations are constructed on the concept that males on moderate are awesome to ladies in lots of sports activities, so ladies wish to be safe from unfair festival.
A large number of state expenses have aimed to prohibit transgender athletes from taking part in sports activities.
Oliver Contreras/AFP by way of Getty Pictures
However elite transgender athletes are uncommon. In a 2024 listening to prior to the U.S. Senate, the president of the NCAA testified that of the 510,000 athletes in U.S. schools at the moment, he was once acutely aware of fewer than 10 transgender athletes – lower than 0.002%.
Just one recognized transgender lady has ever participated in an Olympic ladies’s festival because the committee allowed ladies to compete within the Video games starting in 1900: Laurel Hubbard, a weightlifter who competed for New Zealand in 2021 however didn’t medal.
The rarity of transgender athletes in elite festival suggests their exclusion is an answer looking for an issue.
Organic intercourse is difficult
The genetic check the IOC is requiring is much more likely to spot intersex ladies.
Intersex other people have a mix of usually feminine and usually male organic intercourse characteristics. Those come with intercourse chromosomes, inside and exterior reproductive anatomy, intercourse hormones and hormone receptors.
There are lots of permutations of intersex characteristics, however 3 is also probably the most related for ladies’s athletic competitions: androgen insensitivity, 5-alpha-reductase deficiency and genetic mosaicism.
Other people with androgen insensitivity don’t reply as a lot to androgens like testosterone. Some consider that having top ranges of testosterone can provide athletes a aggressive merit. Athletes with this situation achieve very little merit like muscle enlargement from androgens. This additionally way their visual intercourse traits, together with their genitals, seem most commonly or solely feminine. The brand new IOC coverage has an exception for “complete” androgen insensitivity however doesn’t say how athletes would exhibit this.
The coverage additionally doesn’t point out partial androgen insensitivity, the place androgen receptors reply to testosterone however almost definitely now not sufficient to realize an important merit in functionality. However, athletes with partial androgen insensitivity will probably fail the check and be excluded from taking part below the brand new coverage.
Other people with 5-alpha-reductase deficiency make and reply to testosterone however make little or none of a stronger androgen referred to as dihydrotestosterone, or DHT. If they have got no DHT, their genitals seem extra feminine they usually achieve much less athletic merit from androgens. Other people with this situation who’ve a Y chromosome will fail the brand new intercourse check and be excluded.
Other people with mosaicism are born with some cells that experience a Y chromosome and a few that don’t. Girls can expand mosaicism all over being pregnant, when fetal cells with Y chromosomes pass the placenta into her frame. The girl may have some cells with a Y chromosome, most likely for the remainder of her existence. Such cells may purpose a in the past pregnant athlete to fail the brand new check.
Historical past of intercourse checking out in ladies’s athletics
The IOC and related sports activities federations have an extended historical past of intercourse checking out, particularly for monitor occasions. Intercourse checking out has switched from genitals to genes to testosterone ranges, and now again to genes. Whilst the said function for those insurance policies was once to discover men pretending to be feminine, they have got by no means discovered any. As an alternative, they known and excluded intersex ladies.
For far of the twentieth century, sports activities directors tested genitals if a competitor was once suspected of being male. Within the mid-Nineteen Sixties, they started analyzing the genitals of all ladies taking part in World Newbie Athletics Federation competitions in what had been referred to as “nude parades.”
The nude parades embarrassed athletes and sports activities federations and had been changed by way of newly to be had chromosome or gene checks within the overdue Nineteen Sixties. Those checks had been regularly completed with out knowledgeable consent – athletes had been as a substitute instructed they had been being examined for performance-enhancing medication. The check effects had been then regularly published publicly with out the athlete’s consent.
As an example, in 1967, the Polish sprinter Ewa Klobukowska, who had gained 3 gold medals and set 3 global information, was once designated “male” by way of a chromosome check, despite the fact that she had usually feminine genitals. She was once excluded from festival and compelled to go back her medals. However the next yr, she gave delivery – she it appears had genetic mosaicism.
Ewa Klobukowska (No. 3 bib) had her medals stripped after being incorrectly designated ‘male’ thru genetic checking out.
S&G/PA Pictures by way of Getty Pictures
In 1985, a Spanish hurdler, Maria José Martínez-Patiño, came upon thru a public announcement that she was once designated “male” by way of a genetic check and excluded from festival. “I felt ashamed and embarrassed,” she has stated in a private account. “I lost friends, my fiancé, hope and energy. But I knew that I was a woman and that my genetic difference gave me no unfair physical advantage. I could hardly pretend to be a man; I have breasts and a vagina.” She has entire androgen insensitivity.
Genetic checking out in large part gave solution to checking out testosterone ranges in fresh a long time, which additionally excluded many intersex athletes. The 2026 IOC announcement states that there is not any overlap within the testosterone ranges of male and female elite athletes, however revealed analysis analyzing masses of elite athletes contradicts this commentary.
In 2021, the IOC introduced a brand new coverage mentioning that “Every person has the right to practise sport without discrimination and in a way that respects their health, safety and dignity.” However the committee left it to every recreation’s federation to control their very own competitions, resulting in a complicated mixture of standards that can have prepared the ground for the group’s simplified 2026 coverage.
SRY gene check is deceptive
The IOC’s 2026 coverage hints on the complexity of organic intercourse, mentioning that intercourse comprises “sex chromosomes, gonads and hormones.” However it’s extraordinary that genitals didn’t make their checklist, taking into account that genitals – exterior intercourse organs just like the vagina and penis – are how maximum odd other people outline male and female, how physicians assign intercourse at delivery, and the way the IOC itself outlined intercourse for many years.
Intercourse checking out thru genital inspection, despite the fact that embarrassing and traumatizing for lots of athletes, could have been a greater indicator of athletic merit from androgens like testosterone than the SRY gene. All the way through prenatal building, androgens purpose to start with undefined frame constructions to change into a penis and scrotum; of their absence, or with androgen insensitivity, those constructions change into a clitoris and labia as a substitute. Thus, usually feminine genitals point out low androgen ranges or low sensitivity to androgens, which implies an athlete’s bodily functionality was once now not enhanced by way of those hormones.
Until the IOC takes scrupulous care to display for those exceptions, its new genetic check will most probably exclude athletes who’ve now not won a bonus from androgens. Their new coverage, then again, states that “the need for consistency and fairness across sports” is not going to permit for “case-by-case consideration.”
Because of this, it’s most probably that some other technology of intersex ladies will probably be excluded from the Olympics.
