BASDAI — Bath Ankylosing Spondylitis Disease Activity Index

Calculate the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) using six questions about fatigue, spinal and joint pain, localized tenderness, and morning stiffness to assess axial spondyloarthritis activity.

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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

Calculate the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) using six questions about fatigue, spinal and joint pain, localized tenderness, and morning stiffness to assess axial spondyloarthritis activity

Each component has a specific meaning:

  • Six questions about fatigue — The six questions about fatigue recorded for the scenario being assessed.
  • Spinal — The spinal recorded for the scenario being assessed.
  • Joint pain — The joint pain recorded for the scenario being assessed.
  • Localized tenderness — The localized tenderness recorded for the scenario being assessed.
  • Morning stiffness — The morning stiffness recorded for the scenario being assessed.

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

How to Use

Enter the six questions about fatigue, spinal, joint pain, localized tenderness, morning stiffness for the scenario you are assessing. Calculate the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) using six questions about fatigue, spinal and joint pain, localized tenderness, and morning stiffness to assess axial spondyloarthritis activity. Use the basdai score result to inform your calculation.

Frequently Asked Questions