@jengosmonkey That is a very interesting link. My girl suffered none of the possible side effects. No lethargy, listlessness, weight gain and her shape remained immaculate till the day she died. But she no longer suffered from IBS.
I know that quality breeders will keep the lines as strong as possible while making sure the pups are not affected. Really, that is all anyone can ask.
And chances are that your vet will tell you that there is no test.
Just because it has been available for nearly two years does not mean that they know it is now here.
You can do the fanconi tests without seeing a vet at all. Finger's crossed both your Bs come back NOT affected.