Research reported on in the journal Dermatology found that the frequency of thyroid autoantibodies is significantly higher in patients with chronic urticaria (hives) than in healthy controls. In the study, all the patients with thyroid autoantibodies had so-called "normal" test results. Researchers concluded that
there is a significant association between chronic urticaria and thyroid autoimmunity, but only the thyroid antibody tests are relevant in patients with chronic urticaria, versus thyroid function tests.
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Source: Verneuil L, et. al. "Association between chronic urticaria and thyroid autoimmunity: a prospective study involving 99 patients." Dermatology. 2004;208(2):98-103.