What is the best strategy to determine the cause of chronic urticaria?
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A thorough clinical history is the best strategy to identify the cause of chronic urticaria. Supplementation of the history with a standardized patient questionnaire may help. (SOR: B, based on a small diagnostic cohort study.) Routine laboratory testing does not aid in the diagnosis. (SOR: B, based on prospective cohort studies.)
Evidence Based Practice 14(11): 09-10.