How does GEA differ from IGA?

GEA is a 6-point scale (0-5) while IGA is 5-point (0-4). GEA scale: 0=no lesions, 1=almost clear, 2=mild, 3=moderate, 4=severe, 5=very severe. GEA is widely used in Europe. Both have good correlation with PASI-like counting methods.

What constitutes GEA treatment success in acne trials?

GEA 0 or 1 at week 12-16 with >=2 grade improvement from baseline is the standard European acne trial endpoint. Similar to IGA 0/1 response definition used in North American trials.

Yes. GEA has been validated across multiple European acne clinical trials and shows good inter-rater reliability (weighted kappa 0.63-0.74) and correlation with lesion counts. It is recommended by the European Dermatology Forum.

GEA Global Evaluation Acne

Apply Global Evaluation Acne (GEA) scale for European clinical practice: 0-5 scale considering total lesion count, inflammatory severity, and scarring. Standard for biologic acne trial endpoints in Europe.

Use the full interactive calculator below, or

Related Calculators

Comedone Count

Hyper-niche Medical

GEA Global Evaluation Acne

Related Calculators

Frequently Asked Questions

How does GEA differ from IGA?

What constitutes GEA treatment success in acne trials?

Is GEA validated?