That's normal: A very high result would have suggested allergy, but this normal result sheds no light on the cause of your urticaria. It may be allergic, cholinergic, autoimmune, idiopathic ... The key in the workup of chronic urticaria, in which a cause is found less often than not, is the history. An elimination diet might just possibly reveal an allergy. Read up on chronic urticaria and good luck.
Answered 7/24/2014
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