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A top European court will decide tonight NZT whether double Olympic champion Caster Semenya can be required to lower her testosterone levels to compete as a woman, in a key decision on contested gender testing.

The European Court of Human Rights’ decision comes after a row engulfed the 2024 Paris Olympics over the gender of an Algerian boxing champion.

South African runner Semenya, 34, was the Olympic 800m champion in 2012 and 2016 and world gold medallist in 2009, 2011 and 2017.

She is classed as having “differences in sexual development” but has always been legally identified as female.

Semenya has refused to take drugs to reduce testosterone levels since World Athletics, track and field’s governing body, introduced new rules on women competitors in 2018.

So, she has since been barred from competing in her favoured 800m.

Semenya has said she hopes the court will protect athletes’ human rights and “inspire all young women to be and accept themselves in all their diversity”.

Antoine Duval, a sports law expert at the Asser Institute in The Hague said the case would “determine what comes next in terms of challenging the rules for access to women’s competitions”.

Semenya has already tried other tribunals to try to change the rules.

The Lausanne-based Court of Arbitration for Sport ruled against her in 2019 and the decision was validated by the Swiss Federal Court in Lausanne in 2020. It judged that a testosterone level comparable to that of men gave female athletes “an insurmountable advantage”.

The European Court of Human Rights in 2023 ruled that Semenya was the victim of discrimination by the Court of Arbitration for Sport.

Swiss authorities, supported by World Athletics, appealed to the European court’s 17-member Grand Chamber.

The human rights court’s decision was, however, largely symbolic as it did not call into question the World Athletics ruling nor allow Semenya to return to competition without taking medication.

There are many types of “differences in sexual development”, a group of rare conditions involving genes, hormones, and reproductive organs.

Formerly known as intersexuality, they occur in about one in 1000 to 4500 births.

Before the 2009 world championships, where Semenya won the 800m gold aged just 18, she was forced to undergo gender testing.

She was subsequently put on medication to reduce testosterone levels, spending several months sidelined by World Athletics.

Semenya, born with the “46 XY” chromosome rather than the XX chromosome most females have, said she felt she was being treated like a “human guinea pig” and vowed to never again allow it.

Testosterone is produced by men and women, but men produce 20 times more of the sex hormone.

How much the hormone boosts performance remains a matter of debate.

The International Olympic Committee is weighing reintroducing gender testing, while several sports have already embraced the practice.

World Athletics and World Boxing have adopted chromosomal testing – generally a cheek swab to check for the SRY gene, that reveals the presence of the Y chromosome.

World Aquatics in 2023 adopted a policy that foresees such testing.

Supporters say such screening simplifies access to women’s competition, and United Nations rapporteur Reem Alsalem has said such tests are “reliable and non-invasive”.

But Madeleine Pape, a sociologist of gender in sport, says there is a lack of research proving that transgender athletes or those with one of the many forms of DSD gain a “disproportionate advantage” over XX competitors.

Human Rights Watch has argued that World Athletics regulations “are degrading and invasive of privacy, on grounds that are scientifically contested”.

The gender debate reignited in June around Paris Olympic boxing champion Imane Khelif.

United States President Donald Trump, Italian Prime Minister Giorgia Meloni, and Harry Potter author J.K. Rowling were among those who stoked a row over the Algerian’s gender.

-Agence France-Presse