From the above article.
'“The required test will be for the SRY gene and, if required, testosterone levels, either via cheek swab with any necessary follow-up or via dry blood spot analysis,” World Athletics says in its consultation document. “In this context, the SRY gene, which is almost always on the Y chromosome, is used as a highly accurate proxy for biological sex but makes room for an additional diagnostic process at the athlete’s discretion.”
World Athletics says the cheek-test proposal was recommended by the special rapporteur’s report on female eligibility to the UN general assembly in October last year and is supported by many athletes.
“Available surveys of both the general population and elite female athletes show strong opposition, either steady or growing, to XY athletes competing in the female category.”
As thing stands, DSD athletes are allowed to compete in the female category, providing they lower their testosterone levels to 2.5 n/mol. Those athletes, including Caster Semenya, have undergone male puberty but were reported as female at birth.'