CDAI Clinical Disease Activity Index Calculator


Calculating the Clinical Disease Activity Index (CDAI) is crucial in assessing disease activity in patients with rheumatoid arthritis. This article provides a comprehensive guide on utilizing a CDAI calculator, explaining the formula, offering an example solve, and addressing frequently asked questions.

How to Use

To utilize the CDAI calculator, follow these steps:

  1. Input the required parameters: tender joint count (TJC), swollen joint count (SJC), patient global assessment (PGA), and evaluator global assessment (EGA).
  2. Click the “Calculate” button to obtain the CDAI score.


The CDAI is calculated using the following formula:


  • TJC = Tender Joint Count
  • SJC = Swollen Joint Count
  • PGA = Patient Global Assessment
  • EGA = Evaluator Global Assessment
  • CRP = C-Reactive Protein (mg/dL)

Example Solve

Let’s consider an example:

  • TJC = 10
  • SJC = 8
  • PGA = 50
  • EGA = 40
  • CRP = 2

Plugging these values into the formula:



So, the CDAI score is 64.72.


Q: What is the significance of CDAI in rheumatoid arthritis management?
A: CDAI helps in evaluating disease activity and guiding treatment decisions in rheumatoid arthritis patients.

Q: Can CDAI be calculated without CRP values?
A: Yes, it can be calculated without CRP, but including CRP enhances its accuracy.

Q: Is the CDAI score interpreted differently for different patients?
A: No, the interpretation remains consistent across patients, with higher scores indicating greater disease activity.


The CDAI calculator is a valuable tool for healthcare professionals in assessing disease activity in rheumatoid arthritis patients. By understanding its formula and application, clinicians can make informed treatment decisions, ultimately improving patient outcomes.

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