Background
Cold urticaria (ColdU) is characterized by the appearance of wheals and/or angioedema and itch after exposure to cold stimuli. The Cold Urticaria Activity score (ColdUAS) is a newly devised patient-reported outcome measure (PROM) assessing disease activity in ColdU.
Objectives
We aimed to validate the ColdUAS according to PROM guidelines, assess the optimal documentation period, and develop a scoring computation algorithm.
Methods
We instructed 71 patients with typical and atypical ColdU to complete the ColdUAS questionnaire over 4 consecutive weeks and asked to fill out additional anchor instruments including global assessment tools and validated quality of life measures.











