BASDAI Score
Overall tiredness in the past week
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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✅ Remission
Well-controlled on biologic therapy
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📊 Low Activity
Mild symptoms on NSAIDs
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⚠️ Moderate Activity
Biologic consideration threshold
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🔴 High Activity
Active disease despite treatment
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🚨 Very High Activity
Severely active, urgent escalation
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📈 Partial Response
Improving on biologic but not remission
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Sample Clinical Scenarios
✅ Remission
Well-controlled on biologic therapy
📊 Low Activity
Mild symptoms on NSAIDs
⚠️ Moderate Activity
Biologic consideration threshold
🔴 High Activity
Active disease despite treatment
🚨 Very High Activity
Severely active, urgent escalation
📈 Partial Response
Improving on biologic but not remission
BASDAI Questions (0-10 Scale)
Rate each question from 0 (none) to 10 (very severe) based on your symptoms over the past week.
Clinical Context
Extra-articular Manifestations
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
Understanding BASDAI
The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) is a validated patient-reported outcome measure used to assess disease activity in ankylosing spondylitis (AS) and axial spondyloarthritis (axSpA). Developed in Bath, UK in 1994, it has become the gold standard for monitoring disease activity and treatment response.
Very Low: 0-2
Remission-like state, excellent control
Low: 2-4
Below treatment threshold, good control
Moderate: 4-6
Consider biologic therapy escalation
The 6 BASDAI Questions
Q1: Fatigue
Overall tiredness in the past week
GeneralQ2: Spinal Pain
Pain in spine and hips
AxialQ3: Joint Pain
Pain in other joints
PeripheralQ4: Tenderness
Tenderness at tendon attachments
EnthesealQ5: Stiffness Severity
How bad is the stiffness
StiffnessQ6: Stiffness Duration
How long does it last
StiffnessClinical Decision Points
| BASDAI Score | Disease Activity | Treatment Implication |
| <2 | Remission | Maintain current therapy, may taper |
| 2-4 | Low activity | Continue NSAIDs, regular monitoring |
| ≥4 | Active disease | Biologic therapy if NSAIDs failed |
| ≥6 | High activity | Urgent escalation, rheumatology review |
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