BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) is a patient-reported score used to measure how active ankylosing spondylitis / axial spondyloarthritis is over the past week. It’s one of the most widely used tools in routine care and research.
BASDAI Calculator
Bath Ankylosing Spondylitis Disease Activity Index (0–10, past week – educational use only).
1. Symptom questions (0–10)
Please answer for the past week. 0 = none / no problem, 10 = very severe / worst possible.
How tired or fatigued have you felt?
Pain from your spine / sacroiliac area due to AS.
Joints other than neck, back, or hips.
Areas that are tender to touch or pressure (entheses).
2. Morning stiffness (0–10)
How severe is the stiffness when you wake up?
0 = 0 hours, 5 ≈ 1 hour, 10 = 2 or more hours of morning stiffness.
BASDAI score
0.0
Important:
- This calculator is for education only and does not replace specialist rheumatology advice.
- Scores should be interpreted by a health professional who knows your full medical history.
- Never start, stop, or change treatment based solely on this score.
