BASDAI Score Calculator
BASDAI Questionnaire
How severe is your fatigue or tiredness overall?
How severe is your AS-related pain in the neck, back, or hips?
How severe is pain or swelling in joints other than neck, back or hips?
How much discomfort do you have from areas that are tender to touch or pressure?
How severe is your morning stiffness upon waking?
How long does your morning stiffness last from the time you wake up?
Enter your symptom scores above to calculate your BASDAI score
This BASDAI calculator provides a free, evidence-based way to evaluate disease activity in Ankylosing Spondylitis (AS). By implementing the validated Bath Ankylosing Spondylitis Disease Activity Index, it helps determine how well current treatment is controlling symptoms. The tool is designed for both patients and healthcare professionals seeking a quick, reliable assessment of AS disease activity.
Understanding Ankylosing Spondylitis
Ankylosing Spondylitis is a chronic inflammatory arthritis that primarily affects the spine and sacroiliac joints. Its hallmark symptoms include persistent back pain and stiffness, which tend to worsen over time. The condition usually emerges in early adulthood (between ages 20 and 30) and progresses gradually. Additional manifestations may include peripheral joint pain, fatigue, weight loss, fever, and anterior uveitis. While the exact cause remains unknown, a strong genetic link exists — most individuals with AS carry the HLA-B27 antigen. Although there is no cure, treatments such as NSAIDs (naproxen, ibuprofen), disease-modifying antirheumatic drugs (DMARDs), biologic agents, physical therapy, and surgery can manage symptoms and slow progression.
The BASDAI: Measuring Disease Activity
The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) was developed in 1994 in Bath, England, by a multidisciplinary team of rheumatologists, physiotherapists, and other specialists. It consists of six questions that assess five major symptom domains: fatigue, spinal pain, joint pain or swelling, areas of localized tenderness, and morning stiffness (both duration and severity). Each question uses a 0–10 numeric rating scale, where 0 indicates no problem and 10 represents the most severe problem. Completing the questionnaire typically takes 30 seconds to 2 minutes, making it a practical tool for routine monitoring.
How the BASDAI Score Is Calculated
To compute the final BASDAI score, the answers are combined with extra weight given to morning stiffness. The formula is:
Each question ( through ) ranges from 0 to 10. Because questions 5 and 6 both address morning stiffness, their average is used instead of separate values. The resulting score always falls between 0 and 10.
Interpreting the BASDAI Score
A BASDAI score ≥4 is generally considered indicative of suboptimal disease control. Patients who score at or above this threshold may be candidates for treatment adjustment, initiation of biologic therapy, or enrollment in clinical trials evaluating new AS treatments. Scores below 4 suggest adequate symptom management, though regular monitoring remains important.
Using the BASDAI Calculator
The online BASDAI Score Calculator presents the six questions one by one. Users simply select a value from 0 to 10 that best reflects their experience over the past week. The tool instantly computes the score and provides the interpretation based on the established cutoff. No registration, download, or personal information is required.
Disclaimer: This calculator is for informational purposes only and does not replace professional medical advice. Always consult a healthcare provider for diagnosis and treatment decisions.
FAQ
1. What does the BASDAI measure?
The BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) measures disease activity in AS by evaluating five key symptom areas: fatigue, spinal pain, joint pain or swelling, localized tenderness, and morning stiffness (duration and severity).
2. How is the BASDAI score calculated?
The score is calculated using the formula: (Q1 + Q2 + Q3 + Q4 + (Q5 + Q6)/2) / 5, where each Q is rated from 0 to 10. This produces a final score from 0 to 10.
3. What does a BASDAI score of 4 or higher indicate?
A score of 4 or above usually means suboptimal control of AS. It may suggest that the current treatment needs adjustment, or that the patient could benefit from biologic therapies or clinical trial enrollment.
4. How long does it take to complete the BASDAI questionnaire?
Completing the six questions typically takes between 30 seconds and 2 minutes, making it a quick tool for regular disease activity monitoring.
How to Use
- Rate each of the 6 questions on a 0–10 scale. For questions 1–5, 0 means no problem and 10 means very severe. For question 6, enter the duration of your morning stiffness in hours (0–2+).
- Click the 'Calculate BASDAI Score' button to compute your score.
- Review your total BASDAI score and disease activity category. A score of 4 or higher may indicate the need for treatment adjustment - consult your rheumatologist.