Santhi Soundararajan, an Indian silver medalist female runner at Asian Games who failed a gender test in 2006 It has been reported that during the Beijing Olympics, many athletes were tested to determine their "gender" status.
Suspected athletes will be evaluated from their external appearances by experts and undergo blood tests to examine their sex hormones, genes and chromosomes for sex determination.
Experts say test results for about one in 500 to 600 athletes are abnormal.
Gender verification tests emerged in the 1960s when Communist countries in Eastern Europe were thought to be using male athletes in women’s competitions. The tests were used at the Olympics for the first time at the 1968 Mexico City Games.
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."
It is thought that around one in 1,000 babies are born with an "intersex" condition, the general term for people with chromosomal abnormalities. It may be physically obvious from birth - babies may have ambiguous reproductive organs, for instance - or it may remain unknown to people all their lives. At the Atlanta games in 1996, eight female athletes failed sex tests but were all cleared on appeal; seven were found to have an "intersex" condition. As a result, by the time of the Sydney games in 2000, the IOC had abolished universal sex testing but, as will happen in Beijing, some women still had to prove they really were women.
Transsexuals, who have had a sex change from male to female, can compete in women's events in the Olympics, as long they wait two years after the operation.
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