ToolsCalculators
Urticaria Activity Score (UAS)
Daily wheal and pruritus severity score for chronic spontaneous urticaria.
Urticaria Activity Score (UAS)
Wheals (hives) in the last 24 hours
Pruritus (itch) severity in the last 24 hours
Result0 points (single-day UAS)
Daily UAS of 0 (range 0-6). The standard protocol sums self-reported daily scores over 7 consecutive days to give the UAS7 (range 0-42), used to track chronic urticaria activity and treatment response.
- Daily UAS (wheals + pruritus)
- 0 / 6
When to use
- Daily patient-reported symptom diary in chronic spontaneous (or chronic inducible) urticaria, summed over 7 days as the UAS7 to grade disease activity and monitor treatment response.
Formula
Daily UAS = wheal score (0-3) + pruritus score (0-3), range 0-6 per day. UAS7 = sum of daily UAS over 7 consecutive days, range 0-42.
Pearls and pitfalls
- Should be completed by the patient once daily (e.g., each evening), not retrospectively estimated by the clinician.
- UAS7 is the standard outcome measure in chronic urticaria trials and guideline-based severity/control assessment.
- The single-day severity band shown here (low/moderate/high) is an informal convenience for a single day's score; the validated grading in guidelines applies to the 7-day UAS7 total, not the daily 0-6 score.