The BASDAI is the standard patient-reported measure in axial spondyloarthritis. A score of 4 or more, together with specialist opinion, is used to consider biologic treatment.
How to use the BASDAI Calculator
- 1. Fatigue or tiredness
- 2. Neck, back or hip pain
- 3. Pain or swelling in other joints
- 4. Discomfort from areas tender to touch or pressure
- 5. Severity of morning stiffness
- 6. Duration of morning stiffness
Results update as you type, and every field accepts the units shown in its menu.
How it works
Rate each question on a scale of 0 (none) to 10 (very severe) for the past week.
Inputs explained
| Field | What to enter |
|---|---|
| 1. Fatigue or tiredness | A number |
| 2. Neck, back or hip pain | A number |
| 3. Pain or swelling in other joints | A number |
| 4. Discomfort from areas tender to touch or pressure | A number |
| 5. Severity of morning stiffness | A number |
| 6. Duration of morning stiffness | In hours |
Example values
How the main result changes when 1. Fatigue or tiredness changes and everything else stays at the example values above:
| 1. Fatigue or tiredness | BASDAI |
|---|---|
| 2.5 | 4.1 |
| 3.75 | 4.4 |
| 5 | 4.6 |
| 6.25 | 4.9 |
| 7.5 | 5.1 |
| 10 | 5.6 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
BASDAI = (Q1 + Q2 + Q3 + Q4 + (Q5 + Q6) ÷ 2) ÷ 5
Each question 0–10; morning stiffness duration: 0 h = 0, 2 h or more = 10
Worked example
Inputs — 1. Fatigue or tiredness: 5; 2. Neck, back or hip pain: 6; 3. Pain or swelling in other joints: 3; 4. Discomfort from areas tender to touch or pressure: 4; 5. Severity of morning stiffness: 5; 6. Duration of morning stiffness: 1 hours.
Results — BASDAI = 4.6.
Key terms
- Axial spondyloarthritis
- Inflammatory arthritis mainly affecting the spine.
Frequently asked questions
What BASDAI score is active disease?
4 or more.
How often should BASDAI be done?
At each review, typically every 3–6 months.
What is ASDAS?
An alternative activity score that also uses CRP or ESR.