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Those treatments corresponded to a pet theory of the Geiers that autism stemmed from the interaction of mercury in thimerosal with testosterone, and therefore that reducing testosterone would address autism.

The current rules for DSD athletes, meanwhile, require them to reduce their testosterone levels below 2.5 nmol/L for at least six months to compete in any female category event internationally.

They also had to document testosterone levels four weeks before championship selections.

Anabolic steroids - a man-made substance that copies the male hormone testosterone - are prescription-only class C drugs that are legal for personal use only on medical advice.

Some other physical changes from administering testosterone or estrogen are not reversible, the policy statement said.