In summary, the data on basal basophil FcεRI receptor levels and their distribution according to treatment response (to antihistamine and omalizumab) show that patients with CIndU have similar behaviour to patients with CSU patients in terms of baseline total IgE levels, basophil FcεRI receptor and their response to anti‐IgE treatment, without these parameters being affected by induced urticaria subtypes. This evidence concerns the gene IGHE and urticaria.