Autoimmune Disease Activity Calculator

Disease activity scoring (DAS28, SLEDAI, etc.).

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

Tender joint count (0-28)

Swollen joint count (0-28)

ESR (mm/hr)

Patient VAS (0-100)

Tab to move between fields

Results

DAS28-ESR score

4.33

Activity level (1-4)3

CDAI approximation10.7

Treatment escalation (0/1)1

Activity Level3

How to Use This Calculator

Enter Tender joint count (0-28), Swollen joint count (0-28), and ESR (mm/hr).
Set Patient VAS (0-100).
Review the DAS28-ESR score result.
Use Activity level (1-4) and CDAI approximation to inform your decision.

How the result changes with ESR (mm/hr)

ESR (mm/hr)	DAS28-ESR score
15	3.97
53	4.86
98	5.29
135	5.51

What each input means

Tender joint count (0-28): Number of tender joints out of 28 assessed joints.
Swollen joint count (0-28): Number of swollen joints out of 28 assessed joints.
ESR (mm/hr): Erythrocyte sedimentation rate in mm/hr.
Patient VAS (0-100): Patient global assessment on visual analog scale (0-100mm).

What each result means

DAS28-ESR score: Disease Activity Score using 28-joint count and ESR.
Activity level (1-4): 1 = remission (<2.6), 2 = low (2.6-3.2), 3 = moderate (3.2-5.1), 4 = high (>5.1).
CDAI approximation: Estimated Clinical Disease Activity Index.
Treatment escalation (0/1): 1 = consider treatment escalation for moderate-high activity.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Tender joint count (0-28) = 4, Swollen joint count (0-28) = 2, ESR (mm/hr) = 25, Patient VAS (0-100) = 40 = 4 input(s) provided
Calculate DAS28-ESR score
DAS28-ESR score
4.33 = 4.33
Calculate Activity level
3 = 3
Calculate CDAI approximation
CDAI approximation
10.7 = 10.7