Sebastian Coe indicates IAAF will challenge female testosterone ruling

• Caster Semenya allowed to run at Rio 2016 without monitoring• Cas suspended practice of testosterone regulation in 2015 Sebastian Coe has indicated the IAAF is to challenge the ruling that suspended the monitoring of female athletes with higher than usual levels of testosterone. At the centre of the ruling is South Africa's Caster Semenya, the likely winner of the women's 800m final at the Olympic Games in Rio. Related: The return of Caster Semenya: Olympic favourite and ticking timebomb