BASDAI Score Calculator
Calculate the Bath Ankylosing Spondylitis Disease Activity Index from six symptom questions.
What Is the BASDAI Score?
The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) summarizes six symptom questions from the past week for patients with ankylosing spondylitis. It helps track treatment response over time. For related musculoskeletal tools, see the Barthel Index Calculator with your rheumatology care plan.
How BASDAI Is Calculated
$$BASDAI = \dfrac{Q_1 + Q_2 + Q_3 + Q_4 + \dfrac{Q_5 + Q_6}{2}}{5}$$
Questions 1 through 4 rate fatigue, spinal pain, joint pain, and tenderness on a 0 to 10 scale. Questions 5 and 6 cover morning stiffness severity and duration; their average counts as one domain in the final score.
Clinical Interpretation
A BASDAI score of 4 or greater suggests suboptimal disease control and may prompt treatment adjustment or specialist review. Scores below 4 generally reflect lower disease activity, though symptoms should always be interpreted in clinical context.
Frequently Asked Questions
What does a BASDAI score of 4 mean?
A score of 4 or higher is commonly used as a threshold for active disease and may indicate that current therapy is not adequately controlling symptoms.
How often should BASDAI be measured?
Many clinicians reassess at follow-up visits or when symptoms change. Consistent weekly recall improves comparability between visits.
Why are morning stiffness questions combined?
BASDAI treats stiffness severity and duration as one domain by averaging questions 5 and 6 before dividing by five total domains.
Is BASDAI only for ankylosing spondylitis?
BASDAI was developed for ankylosing spondylitis and related spondyloarthritis. Other conditions may need different activity indices.
Can BASDAI replace rheumatologist assessment?
No. BASDAI supports monitoring but does not replace physical examination, imaging, or individualized treatment decisions.
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