🦴 BASDAI Ankylosing Spondylitis Activity Index
UseEnter the six 0–10 items (fatigue, spinal pain, peripheral joint pain/swelling, enthesitis, morning-stiffness…
SourceGarrett S, et al. A new approach to defining disease status in ankylosing spondylitis: the Bath Ank…
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
The two morning-stiffness items (severity and duration) are averaged before being combined, so they together carry the weight of a single item (original synthesis · not guideline verbatim).
When to use
Enter the six 0–10 items (fatigue, spinal pain, peripheral joint pain/swelling, enthesitis, morning-stiffness severity, morning-stiffness duration) over the past week; the tool returns the index.
How it works
BASDAI = (Q1 + Q2 + Q3 + Q4 + (Q5 + Q6)/2) / 5. A value ≥4 generally indicates active disease.
Key points
- The two morning-stiffness items (severity and duration) are averaged before being combined, so they together carry the weight of a single item (original synthesis · not guideline verbatim).
- A BASDAI ≥4 is a common threshold for active disease and is often part of the assessment before starting or escalating a biologic.
- It is increasingly paired with or replaced by ASDAS, which incorporates CRP and better reflects objective inflammation.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| ① Fatigue/tiredness level | 0 0–10 |
|---|---|
| ② Neck/back/hip pain | 0 0–10 |
| ③ Peripheral joint pain/swelling | 0 0–10 |
| ④ Discomfort on touch/pressure (enthesitis) | 0 0–10 |
| ⑤ Morning stiffness severity | 0 0–10 |
| ⑥ Morning stiffness duration | 0 0–10 |
→BASDAI0/10
- Interpretation threshold：≥4 active
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using BASDAI Ankylosing Spondylitis Activity Index?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does BASDAI Ankylosing Spondylitis Activity Index upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is BASDAI Ankylosing Spondylitis Activity Index calculated in practice? Can you show a worked example?
- Inputs: ① Fatigue/tiredness level 0 0–10, ② Neck/back/hip pain 0 0–10, ③ Peripheral joint pain/swelling 0 0–10, ④ Discomfort on touch/pressure (enthesitis) 0 0–10, ⑤ Morning stiffness severity 0 0–10, ⑥ Morning stiffness duration 0 0–10 → Result: BASDAI 0 /10（Interpretation threshold: ≥4 active）