IHS4 : INTERNATIONAL HIDRADENITIS SUPPURATIVA SEVERITY SCORE SYSTEM

The International Hidradenitis Suppurativa Severity Score System (IHS4) is a validated clinical tool designed to dynamically assess the severity of hidradenitis suppurativa (HS). IHS4 provides a standardized, quantitative method for evaluating disease activity, supporting both clinical practice and research1.

Number of inflammatory nodules
Number of abscesses
Number of draining tunnels (fistulae/sinuses)
The eIHS4 score is:
points
How to Calculate Your Points
IHS4 (points) =
number of nodules
number of abscesses
number of draining tunnels (fistulae/sinuses)
x 1 +
x 2 +
x 4
Point Scale
Mild HS: < 3 points
Moderate HS: 4–10 points
Severe HS: > 11 points
  1. Zouboulis CC, Sinclair R, Tzellos T, et al. Development and validation of the International Hidradenitis Suppurativa Severity Score System (IHS4), a novel dynamic scoring system to assess HS severity. The British journal of dermatology. 2017;177(5):1401-1409. doi:10.1111/bjd.15748 ↩︎