South Africa’s Semenya approached the tribunal in May last year after CAS, sport’s highest court, ruled that World Athletics regulations were necessary for athletes with differences in sexual development (DSDs) in races ranging from 400 metres to a mile, to ensure fair competition.

The Swiss Federal Tribunal reversed a ruling that temporarily lifted the IAAF’s testosterone regulations imposed on her.

A dilemma facing the sports world: How to avoid discrimination against intersex or transgender athletes while ensuring that competitions are fair.

IAAF president Sebastian Coe, speaking in Doha on Thursday, said he was grateful to CAS for the verdict.

The question is not just a 21st-century social justice issue, it’s a technical question that has troubled sports administrators for decades.

The world's governing body of track and field can now impose limits on the testosterone naturally produced in the body of a female athlete — a decision MP Kirsty Duncan says she's disappointed with.

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

There is no direct link between testosterone levels and athletic performance, said two professors.

Fashion Calgary apologized Thursday evening for a tweet about a Rio Olympics event that was posted on its account.