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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

0

None

0

None

1

Mild (present but not annoying or troublesome)

1

<20

2

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

2

20-50

3

Intense (interferes with normal daily activity or sleep)

3

>50

  • 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

Notes:

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

Reference:

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