IGA Investigator Global Assessment Psoriasis

Grade psoriasis severity using IGA (0-4 scale): 0 (clear), 1 (almost clear), 2 (mild), 3 (moderate), 4 (severe). IGA 0/1 response is the standard biologic trial endpoint.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Grade psoriasis severity using IGA (0-4 scale): 0 (clear), 1 (almost clear), 2 (mild), 3 (moderate), 4 (severe). IGA 0/1 response is the standard biologic trial endpoint

Each component has a specific meaning:

  • IGA : 0 — The iga : 0 recorded for the scenario being assessed.
  • 1 — The 1 recorded for the scenario being assessed.
  • 2 — The 2 recorded for the scenario being assessed.
  • 3 — The 3 recorded for the scenario being assessed.
  • 4 — The 4 recorded for the scenario being assessed.

Note: Interpret the iga psoriasis result against the thresholds and context described above.

How to Use

Enter the IGA : 0, 1, 2, 3, 4 for the scenario you are assessing. Grade psoriasis severity using IGA (0-4 scale): 0 (clear), 1 (almost clear), 2 (mild), 3 (moderate), 4 (severe). IGA 0/1 response is the standard biologic trial endpoint. Use the iga psoriasis result to inform your calculation.

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Frequently Asked Questions