They only offer hair sampling here at Intolerance Lab. Currently, the main way to identify the two types of allergies (IgE and Non-IgE) is on the reaction time from consuming or being in contact with the item. If you notice a reaction that is almost instant or within two hours (max), you would normally consult with your GP and he or she might consider a blood test. These are normally essential for more serious allergies—which, fortunately, only account for 2% of all allergies.