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Urticaria activity score

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The Urticaria Activity Score (UAS) is a composite score of itch severity and hive count

The Urticaria Activity Score (UAS) is a commonly used diary-based patient-reported outcome (PRO) measure that assesses the key sign (hives) and symptom (itch) of CSU (chronic spontaneous urticaria) (1)

  • two versions of the daily UAS exist
    • 1) assesses the number of hives and the intensity of itch twice daily (every 12 h), and
    • 2) assesses hive number and itch intensity once daily (every 24 h)

  • both versions can generate a weekly score (UAS7), calculated as the sum of the daily number of hives score and the itch severity score over 7 days. UAS7 values range from 0 to 42, with higher values reflecting higher disease activity

  • the UAS7 is the sum of the average daily UAS over 7 days

  • after 7 days, average daily scores from the morning and evening assessments are added together

  • values can range between 0 to 21 for weekly itch severity, and 0 to 21 for weekly hive count

  • the UAS7 ranges from 0 to 42

Once Daily UAS:

UAS once-daily version: daily scoring for itch and hives

Itch Severity Score

Itch Severity

Hive Severity Score

Number of Hives per 24 hours






Mild (present but not annoying or troublesome)




Moderate (troublesome but does not interfere with normal daily activity or sleep)




Intense (interferes with normal daily activity or sleep)



  • with the daily UAS7, the person records the severity of itching and the number of weals daily for 7 days. A score of less than 7 in 1 week indicates control of disease, whereas a score of more than 28 per week indicates severe disease

Click here for an editable version of the UAS7 calculator


  • study evidence showed that once- and twice-daily UAS7 scores were highly consistent, supporting the use of either version when evaluating CSU activity (1)


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