The Chinese government will begin a "gender determination" process for female athletes to make sure they're not too manly:

Experts at the lab, located at the Peking Union Medical College Hospital, will evaluate cases based on their external appearance and take blood samples to test hormones, genes and chromosomes…
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The concept has drawn criticism over the years, largely because certain chromosomal abnormalities may cause a woman to fail a test, even though it gives her no competitive advantage. Also, if a female athlete fails a test she must have a physiological examination, which many consider invasive and a privacy violation.
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At the 1996 Atlanta Games, eight athletes failed the tests but were all cleared by subsequent examinations. Santhi Soundarajan, a middle-distance runner from India, was stripped of an Asian Games silver medal in 2006 after failing a gender verification test.

We wonder where a post-op male-to-female would stand…