How is DAPSA calculated?

DAPSA = TJC68 + SJC66 + Patient pain (0-10) + Patient global activity (0-10) + CRP (mg/dL); remission ≤4; LDA 5-14; moderate 15-28; high >28; validated for peripheral psoriatic arthritis (not axial disease).

What is the Minimal Disease Activity (MDA) criteria for PsA?

MDA: ≥5 of 7 criteria met: TJC ≤1, SJC ≤1, PASI ≤1, patient pain VAS ≤15, PGA ≤20, HAQ ≤0.5, TPoT (tender periarticular tender) ≤1; MDA is the T2T target recommended by EULAR 2023.

Which PsA domains are not captured by DAPSA?

DAPSA does not capture: skin disease (PASI/IGA), nail disease (NAPSI), axial involvement, enthesitis, dactylitis, or fatigue; composite tools like CPDAI or PASDAS capture all domains; DAPSA is focused on peripheral joint activity.

What biologics are first-line for PsA?

TNF-α inhibitors (adalimumab, certolizumab, etanercept, golimumab, infliximab) have 40-70% MDA rates; IL-17A inhibitors (secukinumab, ixekizumab) show superior skin and joint response; IL-23 inhibitors (guselkumab, risankizumab) newer options; JAK inhibitors for polyarticular disease.

How should axial PsA be assessed separately?

BASDAI (Bath AS Disease Activity Index) and ASDAS (AS Disease Activity Score) assess axial disease in PsA; spinal MRI can detect sacroiliitis even without clinical back symptoms; axial disease usually responds to TNF-α or IL-17 inhibitors, not IL-23 inhibitors.

Psoriatic Arthritis Disease Activity Score (DAPSA) Calculator

Calculates DAPSA (Disease Activity index for PSoriatic Arthritis) from TJC68/SJC66, patient global assessment, pain VAS, and CRP to guide treat-to-target management in psoriatic arthritis.

Weight

Height

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.

How It Works

Calculates DAPSA (Disease Activity index for PSoriatic Arthritis) from TJC68/SJC66, patient global assessment, pain VAS, and CRP to guide treat-to-target management in psoriatic arthritis

Each component has a specific meaning:

TJC68/SJC66 — The tjc68/sjc66 recorded for the patient or scenario being assessed.
Pain VAS — The pain vas recorded for the patient or scenario being assessed.
CRP — The crp recorded for the patient or scenario being assessed.

Note: Interpret the dapsa score result against the clinical thresholds and context described above.

How to Use

Enter the TJC68/SJC66, pain VAS, CRP for the patient or scenario you are assessing. Calculates DAPSA (Disease Activity index for PSoriatic Arthritis) from TJC68/SJC66, patient global assessment, pain VAS, and CRP to guide treat-to-target management in psoriatic arthritis. Use the dapsa score result to inform your clinical assessment.

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