CHOP used to use Ambry. They now use Genzyme and will test for 1000+ but I believe it's only if they don't first find 2 mutations in one of the more common panel tests. On the Genzyme form they can check to continue testing further if one or none mutations are found.
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<br />When I asked why they no longer used Ambry. I got an answer to the effect of that Ambry was finding mutations in lots of people and they didn't know what to tell all these mildly or symptomless effected folks.
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<br />I guess it's annoying to be at the forfront of science and discovery
...and probably expensive
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<br />Sort of makes you wonder if there was ever a true testing of carrier status done on the population just what the accurate incidence of cf mutations would be, eh?