DAS28 score
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The DAS28 score calculator is a tool used to assess rheumatoid arthritis activity in patients. It combines four variables: tender joints (T), swollen joints (S), erythrocyte sedimentation rate (ESR), and patient global assessment (PGA). The result ranges from 0 to 10, categorizing disease activity as low, moderate, or high.
The calculation uses specific formulas for each variable: square roots of T and S are multiplied by fixed weights, while the natural logarithm of ESR and PGA are proportionally adjusted. This combination standardizes the assessment, enabling comparison across different monitoring periods or patients.
This tool is essential for rheumatologists, allowing them to monitor treatment effectiveness and adjust therapeutic plans. Patients can also use it to better understand their clinical condition, provided they are guided by a healthcare professional.
It is important to note that the DAS28 is a guideline score. Abnormal results should be discussed with a doctor, as other clinical factors may influence interpretation. It does not replace diagnosis or specialized follow-up.
Frequently asked questions
What is the DAS28 score?
The DAS28 is an index that measures rheumatoid arthritis activity, using clinical and laboratory data to classify disease severity.
How to interpret the DAS28 result?
Below 2.6: low activity; 2.6 to 5.1: moderate; above 5.1: high. Higher scores indicate worsening condition.
Why is erythrocyte sedimentation rate important?
ESR reflects systemic inflammation common in rheumatoid arthritis, helping assess disease impact beyond joints.
Can I calculate DAS28 alone?
It is recommended to perform the assessment with a rheumatologist, as it requires precise clinical and lab tests.
When to use the DAS28 calculator?
In regular check-ups to monitor medication response, therapeutic adjustments, or clinical deterioration investigation.