Which skin tests are indicated in the workup of chronic urticaria?

Updated: Jul 31, 2018
  • Author: Marla N Diakow, MD; Chief Editor: William D James, MD  more...
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Answer

Other tests that may be required include challenge testing. Testing to cold, pressure, heat, ultraviolet light, and visible light may be required to exclude a physical urticaria. [32]

Prick or radioallergosorbent assay testing may be useful if contact urticaria is suggested. Skin prick test results may help identify a food allergy, which is a rare cause of chronic urticaria.

Although histologic examination is not necessary for the diagnosis of urticaria, a skin biopsy is necessary for the diagnosis of urticarial vasculitis or a neutrophil-predominant pattern of urticaria that may not respond well to antihistamines. A skin biopsy is indicated for patients in whom individual urticarial lesions persist for more than 24 hours or are associated with petechiae or purpura and for patients with systemic symptoms such as fever, arthralgia, or arthritis.


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