The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) is a short, six-question tool that captures how active your axial spondyloarthritis has felt over the last week. Complete it, save your result to track it over time, and print it to bring to your rheumatology appointment.
iAnswer each question based on how you have felt over the last 7 days, not just today. There are no right or wrong answers. This tool runs entirely in your browser: nothing you enter is saved to a server or sent anywhere. Saving a result stores it only in this browser, on this device.
Q1. Fatigue
How would you describe the overall level of fatigue or tiredness you have experienced?
0
NoneVery severe
Q2. Spinal pain
How would you describe the overall level of AS neck, back, or hip pain you have had?
0
NoneVery severe
Q3. Other joint pain or swelling
How would you describe the overall level of pain or swelling in joints other than your neck, back, or hips?
0
NoneVery severe
Q4. Tenderness
How would you describe the overall level of discomfort you have had from any areas tender to touch or pressure (such as at the heel, chest wall, or spine)?
0
NoneVery severe
Q5. Morning stiffness: severity
How would you describe the overall level of morning stiffness you have had, from the time you wake up?
0
NoneVery severe
Q6. Morning stiffness: duration
How long does your morning stiffness last, from the time you wake up? (0 = no stiffness, 5 = about 1 hour, 10 = 2 hours or more)
0
NoneVery severe
Your BASDAI score
0.0
out of 10
0 · inactive4.0 · common threshold for active disease10 · very active
Move the sliders above to see your score.
About the scale. A BASDAI of 4.0 or higher is the most widely used and best-established cutoff, taken to suggest active disease that may need a treatment review (Garrett et al, 1994; used internationally, including in NICE criteria for biologic eligibility). Beyond this single cutoff there is no universally agreed, formally validated set of BASDAI severity bands, unlike the related ASDAS score, which does have ASAS-endorsed disease-activity categories. Treat any single score as one data point for a conversation with your team, not a diagnosis or a treatment decision on its own.
Your saved results
Dr. Dharini Mahendira Rheumatology · BASDAI result ·
Question
Response
How the score is calculated
BASDAI = (Q1 + Q2 + Q3 + Q4 + the average of Q5 and Q6) ÷ 5. The two morning-stiffness questions are averaged together first because they measure the same symptom (severity and duration), then combined with the other four.
Garrett S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P, Calin A. A new approach to defining disease status in ankylosing spondylitis: the Bath Ankylosing Spondylitis Disease Activity Index. J Rheumatol. 1994;21(12):2286 to 2291.
