How do you get intolernaces/allergies tested?

[MummzySair]

As above they may also make you do an illimination diet to make sure that is the only intollerance/allergy

[beansbeans!]

Thanks ladies,
although I have to admit the bowel sample was not what I was expecting.. I had heard it was a blood test (a friend has to get her daughter tested, and the gp took a blod sample). I dont mind the idea of an illmination diet, well Im doing that now anyhow so wouldnt be too much of a bother anyhow!

Thank you