BASDAI — Bath Ankylosing Spondylitis Disease Activity Index

Calculates the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) from 6 questions covering fatigue, spinal pain, joint pain, peripheral enthesitis, morning stiffness intensity, and morning stiffness duration. Score 0–10; ≥4 indicates high disease activity warranting therapy change.

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.
Advertisement

How It Works

Calculates the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) from 6 questions covering fatigue, spinal pain, joint pain, peripheral enthesitis, morning stiffness intensity, and morning stiffness duration. Score 0–10; ≥4 indicates high disease activity warranting therapy change

Each component has a specific meaning:

  • 6 questions covering fatigue — The 6 questions covering fatigue recorded for the scenario being assessed.
  • Spinal pain — The spinal pain recorded for the scenario being assessed.
  • Joint pain — The joint pain recorded for the scenario being assessed.
  • Peripheral enthesitis — The peripheral enthesitis recorded for the scenario being assessed.
  • Morning stiffness intensity — The morning stiffness intensity recorded for the scenario being assessed.
  • Morning stiffness duration — The morning stiffness duration recorded for the scenario being assessed.

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

How to Use

Enter the 6 questions covering fatigue, spinal pain, joint pain, peripheral enthesitis, morning stiffness intensity, morning stiffness duration for the scenario you are assessing. Calculates the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) from 6 questions covering fatigue, spinal pain, joint pain, peripheral enthesitis, morning stiffness intensity, and morning stiffness duration. Score 0–10; ≥4 indicates high disease activity warranting therapy change. Use the basdai result to inform your calculation.

Related Calculators

DAS28

Medical

SDAI

Medical

Frequently Asked Questions