BASFI (Ankylosing Spondylitis Functional Index)
Bath Ankylosing Spondylitis Functional Index (BASFI, 0–10): the mean of ten 0–10 function/coping items; a higher index means poorer function.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Item 1
- 2
- Item 2
- 3
- Item 3
- 4
- Item 4
- 5
- Item 5
- 6
- Item 6
- 1
- Item 7
- 2
- Item 8
- 3
- Item 9
- 4
- Item 10
- 5
Result: BASFI 3.5 — mean of 10 items (0 = easy, 10 = impossible).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Framing
- A higher index means poorer function. The index has no fixed treatment cut-point; it tracks change over time.
What you enter
- Item 1 (0–10)
- Item 2 (0–10)
- Item 3 (0–10)
- Item 4 (0–10)
- Item 5 (0–10)
- Item 6 (0–10)
- Item 7 (0–10)
- Item 8 (0–10)
- Item 9 (0–10)
- Item 10 (0–10)
How this is calculated
- Formula
- Ten 0–10 items (eight daily-living tasks + two coping items; 0 = easy, 10 = impossible); BASFI = the mean of the 10 items, scored 0–10.
Calin A, Garrett S, Whitelock H, Kennedy LG, O’Hea J, Mallorie P, Jenkinson T. 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. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.