OpiCalc

805 Clinical Tools

7-Point Dermoscopy Checklist ABSI (Burn Severity)AGEP Score AJCC Melanoma Staging ALDEN Algorithm BWH SCC Staging Body Surface Area (BSA)Breslow & Clark Microstaging CTCAE Skin Toxicity DLQI EASI Score GAGS (Acne)HiSCR IGA IHS4 Lund-Browder Chart MSK Melanoma Nomogram Melanoma Risk Screening PASI Score POEM Parkland Formula RegiSCAR DRESS Validation Revised Baux Score SCORAD SCORTEN mPASI

OpiCalc

Open-access clinical infrastructure. Built to the standard every clinician deserves — fast, private, and free.

Zero data stored

Always free

Our mission & transparency

Get in Touch

Tool request, clinical feedback, or partnership inquiry — we read everything.

WhatsApp feedback

Partnership inquiry

© 2026 OpiCalc • Calculated Care

Mission Privacy Terms

IHS4

International HS Severity Score (IHS4): A dynamic tool for grading Hidradenitis Suppurativa severity at point-of-care.

Inflammatory Nodules

0

× 1 point

Abscesses

0

× 2 points

Draining Tunnels

0

× 4 points

Guidelines & Evidence

Clinical Details

Section 1

When to Use

When to Use

Quantifying the dynamic severity of Hidradenitis Suppurativa (HS).

Superior to Hurley staging for monitoring treatment response.

Section 2

Formula & Logic

Scoring Algorithm

Points = (Nodules × 1) + (Abscesses × 2) + (Tunnels/Draining Sinuses × 4).

Section 3

Pearls/Pitfalls

Severity Categories

≤3: Mild

4-10: Moderate

≥11: Severe

Section 4

Next Steps

Management Shift

Moderate to Severe IHS4 scores frequently require systemic adalimumab or other biologics as per international guidelines.

Section 5

Evidence Appraisal

Primary Reference

Development and validation of the International Hidradenitis Suppurativa Severity Score System (IHS4).

Zouboulis CC et al. • Br J Dermatol. 2017;177(5):1401-1409

Last Comprehensive Review: 2026

Related Dermatology Tools

ALDEN Algorithm

Body Surface Area

Breslow & Clark Microstaging

BWH SCC Staging

CTCAE Skin Toxicity

Have feedback about this calculator?Let us know.