Don't want to put a dampner on it, but here is a posting I've put on AB previously:
An elimination diet is the only true way of checking for a food intolerance - check with your GP for details. As for allergy testing, none of the ones you see in health food shops and online are worth the paper they are written on. Blood tests that claim levels of antibody reaction/IgE in the blood indicate allergy are incorrect - your body just reacts to every kind of food when it is ingested, and this is not a bad thing.
Skin prick/scratch tests are also available on the NHS but still not as reliable as an elimination diet - which is what doctors tend to use nowadays instead.
I know of several people who have ordered online blood allergy tests and have still had symptoms. After undergoing elimination diets through an NHS nutritionist, they have found they are intolerant to entirely different foods than the ones the reports have listed. I would suggest you don't waste your money and get advice off your GP instead.
*** In addition to this - if there is any mention of Vega tests, then save your money and run a mile - it is complete and utter hokum and there has never been any proof they work.
And have a look at:
http://www.bbc.co.uk/insideout/south/series2/f ood_sensitivity_allergy_vega_tests.shtml