The IAAF released its new rules on October 14 2019.
Under the new regulations a Transgender female athlete is no longer required to be recognised by law in her new gender but should provide a signed declaration that her gender identity is female.
She must demonstrate to the satisfaction of the Expert Panel that the concentration of testosterone in her serum has been less than 5nmol/L continuously for a period of at least 12 months prior to being declared eligible, and must keep her serum testosterone concentration below that level to maintain her eligibility to compete in the female category.
The new World Athletics policy insists that its stipulations for transgender athletes are actually generous. “The decision limit also takes into consideration that, for clinical purposes, the Endocrine Society Clinical Practice Guideline for Endocrine Treatment of Gender-Dysphoric/Gender-Incongruent Persons recommends that transgender females should have serum testosterone levels of less than 50 ng/dL (i.e. approximately 1.7 nmol/L).”
But while DSD and transgender athletes face different issues, Semenya and other DSD athletes have set a precedent by withdrawing from competition rather than bring their levels down to the 5 nmol/L standard. In CAS proceedings, Semenya said she experienced regular fevers, night sweats, significant weight gain and constant abdominal pain while taking medication to meet the previous standard of 10 nmol/L.
https://olympics.nbcsports.com/2019...me-standard-that-has-kept-out-caster-semenya/
(Sounds like she was having symptoms similar to PMT or menopause.)
I've heard recommendations from runners to have trans/intersex running events.
As a runner, I've participated in all-female runs a couple of times.
Women runners are well aware of the physical advantages biological males have, as seen in the stats/results of every race.
Male hearts and lungs are 10-15% larger, meaning higher VO2 Max (oxygen in blood efficiency) and muscles are stronger, all contributing to 10-15% faster average speed.