Small P, Barrett D, Champlin E
Ann Allergy. 1982 Mar;48(3):172-4.
Of 231 patients with chronic urticaria, eight presented with arthritis. All had elevated sedimentation rates, five had depressed complement (CH50) and two elevated serum immune complexes (IC). Skin biopsies were abnormal in only four patients, unrelated to abnormalities of CH50 or IC. No single diagnostic test was consistently abnormal.