BASFI Calculator for Axial Spondyloarthritis

Rate Each Activity (Past Week)

For each activity below, rate how easy or difficult it is to do without the use of aids. Answer based on your ability over the past week. 0 = Easy / No difficulty. 10 = Impossible / Unable to do.

1. Putting on your socks or tights without help or aids (e.g. sock aid)?

0 (Easy)10 (Impossible)

2. Bending forward from the waist to pick up a pen from the floor without an aid?

0 (Easy)10 (Impossible)

3. Reaching up to a high shelf without help or aids (e.g. helping hand)?

0 (Easy)10 (Impossible)

4. Getting up from an armless dining room chair without using your hands or any other help?

0 (Easy)10 (Impossible)

5. Getting up from the floor without help from lying on your back?

0 (Easy)10 (Impossible)

6. Standing unsupported for 10 minutes without discomfort?

0 (Easy)10 (Impossible)

7. Climbing 12 to 15 steps without using a handrail or walking aid, one foot on each step?

0 (Easy)10 (Impossible)

8. Looking over your shoulder without turning your body?

0 (Easy)10 (Impossible)

9. Doing physically demanding activities (e.g. physiotherapy exercises, gardening, or sports)?

0 (Easy)10 (Impossible)

10. Doing a full day's activities whether it be at home or at work?

0 (Easy)10 (Impossible)

📊 Interpreting the Score

BASFI	Functional Status	Clinical Meaning
0 to 2	Good Function	Minimal functional limitation. Consistent with low disease activity.
2 to 4	Mild Limitation	Some functional restriction. Monitor for progression.
4 to 6	Moderate Limitation	Meaningful functional impairment. Associated with increased work disability risk.
> 6	Severe Limitation	Significant disability. Review disease control and consider physiotherapy referral.

BASFI MCID: approximately 0.7 points. A change of this magnitude is considered clinically meaningful in the context of therapeutic intervention.

💡 Pearls and Pitfalls

✓

BASFI captures the functional consequences of both inflammation and structural damage. Patients with long-standing radiographic damage may have persistently elevated BASFI even when inflammatory disease is well controlled. A high BASFI with well-controlled ASDAS-CRP suggests functional disability driven by structural changes rather than active inflammation.

⚠

BASFI may not differentiate peripheral from axial disease burden. In patients with significant peripheral arthritis (especially PsA), BASFI may reflect peripheral joint limitation rather than spinal/axial disease. For PsA functional assessment, the HAQ-DI is more validated.

🔬 Evidence

BASFI was developed by Calin, Garrett, and colleagues and published in the Journal of Rheumatology in 1994. The 10-item questionnaire was designed to assess function specifically relevant to axial spondyloarthritis. Validation demonstrated strong correlation with clinical measures and radiographic progression, and BASFI has been incorporated into the Bath indices as the standard functional outcome for AS/axial SpA.

View References▾

Calin A, Garrett S, Whitelock H, et al. A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath Ankylosing Spondylitis Functional Index. J Rheumatol. 1994;21(12):2281-2285.

For clinical decision support only. BASFI is a functional assessment tool for axial SpA. High BASFI does not always indicate active inflammation; structural damage independently contributes to functional limitation.

🔗 Related

BASFI Score

5.00

/ 10

024610

Moderate Limitation

Clinical Interpretation

Adjust the sliders above. BASFI = average of all 10 responses.

BASFI = (Q1+Q2+...+Q10) / 10

BASFIBath AS Functional Index

BASFI
Bath AS Functional Index