Caster Semenya has lost her appeal against rules designed to decrease naturally high testosterone levels in some female runners.

The Court of Arbitration for Sport’s panel of three judges gave a complex verdict and “dismissed both requests for arbitration” from Semenya and the governing body of track and field.

In a landmark judgment, the court says the IAAF’s proposed rules on athletes with “differences of sex development (DSD)” are discriminatory.

FILE - In this Friday, April 13, 2018 file photo South Africa's Caster Semenya celebrates after winning the woman's 800m final at Carrara Stadium during the 2018 Commonwealth Games on the Gold Coast, Australia. Caster Semenya will find out Wednesday, May 1, 2019 if she has won her appeal against IAAF rules to curb female runners' high natural levels of testosterone. (AP Photo/Mark Schiefelbein, File)
FILE – In this Friday, April 13, 2018 file photo South Africa’s Caster Semenya celebrates after winning the woman’s 800m final at Carrara Stadium during the 2018 Commonwealth Games on the Gold Coast, Australia. Caster Semenya will find out Wednesday, May 1, 2019 if she has won her appeal against IAAF rules to curb female runners’ high natural levels of testosterone. (AP Photo/Mark Schiefelbein, File)

However, the judges ruled 2-1 that “on the basis of the evidence submitted by the parties, such discrimination is a necessary, reasonable and proportionate means of achieving the IAAF’s aim of preserving the integrity of female athletics in the Restricted Events.”

The IAAF believes female runners with high testosterone levels have an unfair advantage in events from 400 meters to the mile.

Semenya, a two-time Olympic champion in the 800 meters, will now be forced to medicate to suppress her testosterone levels if she wants to defend her world title in September in Doha, Qatar.

FILE - In this Wednesday, Aug. 19, 2009 file photo South Africa's Caster Semenya celebrates as she crosses the finish line to win the gold medal in the final of the Women's 800m during the World Athletics Championships in Berlin. Caster Semenya will find out Wednesday, May 1, 2019 if she has won her appeal against IAAF rules to curb female runners' high natural levels of testosterone. (AP Photo/Anja Niedringhaus, File)
FILE – In this Wednesday, Aug. 19, 2009 file photo South Africa’s Caster Semenya celebrates as she crosses the finish line to win the gold medal in the final of the Women’s 800m during the World Athletics Championships in Berlin. Caster Semenya will find out Wednesday, May 1, 2019 if she has won her appeal against IAAF rules to curb female runners’ high natural levels of testosterone. (AP Photo/Anja Niedringhaus, File)

However, the CAS judges say the IAAF should not yet apply the rules to the 1,500.

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