Tokyo 2020: What are the testosterone rules in women's athletics?

The complex testosterone regulations in track and field have become an issue again at the Olympics after two teenagers from Namibia qualified for the women’s 200-meter final

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IOC Overhauls Rules for Transgender Athletes, Scraps Testosterone Criteria - Bloomberg

Bombshell: World Athletics Admits its Research Underpinning DSD Regulations is Potentially Misleading

Will new Olympics rules exclude or include transgender athletes?

Scientists Correct Study That Helped Limit Some Female Runners - The New York Times

IOC: Trans Women Shouldn't Have to Reduce Testosterone to Compete at Olympics

Restrictions on Female Testosterone Levels Upheld in Caster Semenya Case

The Olympics Is Scrapping Testosterone Limits for Trans Athletes

Tokyo 2020: Caster Semenya confirms she will not attempt 200m Olympics qualification, Olympics News