In certain embodiments, the present invention relates to methods, compositions, and kits for diagnosing autoimmune chronic urticaria. For example, in certain embodiments, such methods generally comprise detecting the presence of auto-antibodies to cell-surface IgE receptors or cell-bound IgE in a patient. Such auto-antibodies may be detected by (a) obtaining donor basophils and associated leukocytes from one or more donors, (b) challenging the donor basophils and associated leukocytes with control serum and quantifying the amount of histamine released by the donor basophils and associated leukocytes, (c) calculating a normalized baseline of histamine release, wherein the normalized baseline of histamine release represents a mean percentage of histamine released by the basophils and associated leukocytes of an individual donor plus a specified amount above such mean, (d) reacting patient serum with the donor basophils and associated leukocytes, (e) measuring the percentage of histamine released by the donor basophils and associated leukocytes in response to the patient serum, and (f) comparing the percentage of histamine released by the donor basophils and associated leukocytes in response to the patient serum to the normalized baseline of histamine release.