Caster Semenya

Between 50 and 60 athletes who went through male puberty have been finalists in the female category in global and continental track and field championships since 2000, according to a senior World Athletics official.

World Athletics has introduced SRY screening, a gene test that uses a cheek swab to assess if someone is biologically male or female, for the world championships in Tokyo.

In a presentation to a scientific panel in the Japanese capital on Friday, Dr Stéphane Bermon, head of health and science at World Athletics, outlined why the sport’s governing body believes such screens are necessary as he presented data collected over the past 25 years. He said it showed that athletes with differences of sex development (DSD), who have a 46 XY karyotype with male testes but were reported female at birth, were significantly “over-represented” in major finals and that it “compromises the integrity of the female competitions”.

https://www.theguardian.com/sport/2025/sep/19/sex-tests-brought-in-after-data-showed-50-60-dsd-athletes-in-finals-world-athletics-says

Caster Semenya, who won Olympic gold at the 2012 and 2016 Games, has not raced at elite level since World Athletics introduced rules requiring DSD individuals to suppress their testosterone levels.