"But we do not have the test to do that".
Half of them have the test repeated within three years.
People with polyps are usually told to have the test every three years.
But Dr. Kramer was also cautious about offering a blanket recommendation that everyone 50 and older have the test.
In June, his wife became what her doctor says is the first private patient in Arizona to have the test.
If you are left with any doubt, check with your insurance company before you have the test.
The French are on an even tighter timetable than the Australians because of their desire to have the test ready for the Tour.
The work and pensions secretary, Iain Duncan Smith, has refused to withdraw the demand despite losing an earlier attempt to have the test case dismissed.
But a person would need to have the test only once in a lifetime, and it would apply to all the drugs metabolized by that enzyme.
And those who had the gene were no less likely than the others to say they would have the test all over again, the researchers said.
While some of the diseases can also be detected through amniocentesis, the procedure poses a risk to the fetus, and many women do not have the test done.
