SDAI — Simplified Disease Activity Index for Rheumatoid Arthritis

Calculates the Simplified Disease Activity Index (SDAI) for RA using tender joint count (28), swollen joint count (28), patient global assessment, physician global assessment, and CRP (mg/dL). Remission ≤3.3, low ≤11, moderate ≤26, high >26.

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.
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How It Works

Calculates the Simplified Disease Activity Index (SDAI) for RA using tender joint count (28), swollen joint count (28), patient global assessment, physician global assessment, and CRP (mg/dL). Remission ≤3.3, low ≤11, moderate ≤26, high >26

Each component has a specific meaning:

  • Tender joint count — The tender joint count recorded for the scenario being assessed.
  • Swollen joint count — The swollen joint count recorded for the scenario being assessed.
  • CRP — The crp recorded for the scenario being assessed.

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

How to Use

Enter the tender joint count, swollen joint count, CRP for the scenario you are assessing. Calculates the Simplified Disease Activity Index (SDAI) for RA using tender joint count (28), swollen joint count (28), patient global assessment, physician global assessment, and CRP (mg/dL). Remission ≤3.3, low ≤11, moderate ≤26, high >26. Use the sdai result to inform your calculation.

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Frequently Asked Questions