There are many companies selling allergy tests in stores an on the Internet. In this video Dr. Peter Saul describes the most common tests available and explains how they work, their reliability and possible pitfalls.
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DIY allergy tests, do they work? Dr. Peter Saul: The two sorts of allergy tests that are quite common out there so to speak are hair analysis and what's called VEGA testing. Hair analysis is what it says. Somebody sends off the hair and they do stuff with it and they come back with a reports and say you're allergic to X, Y and Z. VEGA is where you hold electrodes. It's not harmful. They're not 1000 volts or anything. You hold electrodes, it's connected to a meter and then the practitioner then gives and puts different allergens on the skin and they look for the resistance. There is no evidence that they actually give you a true picture of what your allergies are. They're also quite expensive and if you speak to your GP, he or she will be able to do the blood test quite easily and if you want the skin prick testing, he or she can refer you to an allergy clinic where it can be done.

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