Urticaria Activity Score over 7 days (UAS7)

Weekly disease activity in chronic spontaneous urticaria, sum of daily wheal (0-3) and itch (0-3) scores over 7 days (range 0-42).

Evidence tier: Validated instrument.

Formula / logic

Each day: wheal-number score (0-3) + pruritus-intensity score (0-3) = daily 0-6. UAS7 = sum of 7 daily scores (range 0-42). Bands: 0 urticaria-free; 1-6 well-controlled; 7-15 mild; 16-27 moderate; 28-42 severe.

Interpretation

Standard activity endpoint for CSU trials and clinical follow-up. Minimal important difference commonly cited around 9-11 points.

Evidence & citations

  1. Młynek A, Zalewska-Janowska A, Martus P, et al. How to assess disease activity in patients with chronic urticaria? Allergy. 2008;63(6):777-780. PMID 18445192
  2. Hawro T, Ohanyan T, Schoepke N, et al. The Urticaria Activity Score, validity, reliability, and responsiveness. J Allergy Clin Immunol Pract. 2018;6(4):1185-1190.e1. PMID 29128337

Clinician decision support. Verify against the cited source. Not a substitute for clinical judgment. 100% on-device; no patient data is stored or transmitted.