📊 PASI Psoriasis Area Severity Index Calculator Simulator

Scoring Body Surface Area Involvement

Placeholder: area involvement is scored per region on a 0-6 scale.

• 0–6: Area scale (Placeholder scale range)
• 4: Regions scored (Placeholder region count)
• 90–100%: Max BSA bracket (Placeholder top bracket)
• <10%: Min BSA bracket (Placeholder low bracket)

Region area brackets

Placeholder text describing area scoring brackets briefly.

Grading Erythema Severity

Placeholder: erythema graded 0 (none) to 4 (severe) per region.

• 0–4: Erythema scale (Placeholder scale range)
• Clear: 0 = none (Placeholder grade label)
• Deep red: 4 = severe (Placeholder grade label)
• Region: Assessed per (Placeholder unit)

Erythema assessment

Placeholder text describing erythema grading briefly.

Grading Scaling Severity

Placeholder: scaling graded 0 (none) to 4 (coarse) per region.

• 0–4: Scaling scale (Placeholder scale range)
• Smooth: 0 = none (Placeholder grade label)
• Thick scale: 4 = severe (Placeholder grade label)
• Region: Assessed per (Placeholder unit)

Scaling assessment

Placeholder text describing scaling grading briefly.

Grading Plaque Thickness

Placeholder: thickness graded 0 (flat) to 4 (very thick) per region.

• 0–4: Thickness scale (Placeholder scale range)
• Flat: 0 = none (Placeholder grade label)
• Marked plaque: 4 = severe (Placeholder grade label)
• Region: Assessed per (Placeholder unit)

Thickness assessment

Placeholder text describing thickness grading briefly.

Calculating the Weighted PASI Total

Placeholder: regional weights combine into a single 0-72 PASI score.

• 0–72: PASI range (Placeholder full scale)
• 0.1: Head weight (Placeholder region weight)
• 0.3: Trunk weight (Placeholder region weight)
• 0.4: Legs weight (Placeholder region weight)

Final formula

Placeholder text describing the weighted PASI formula briefly.

Placeholder: PASI = Σ weight × (erythema+scaling+thickness) × area score.