The gold standard for measuring and evaluating disease activity in Ankylosing Spondylitis is the BASDAI, or the Bath Ankylosing Spondylitis Disease Activity Index. The BASDAI is the result of the work of a research team consisting of rheumatologists, physiotherapists, and research associates with a special interest in AS who developed the index in Bath, England. The BASDAI consists of a one through 10 scale (one being no problem and 10 being the worst problem) which is used to answer 6 questions pertaining to the 5 major symptoms of AS:

• Fatigue
• Spinal pain
• Joint pain / swelling
• Areas of localized tenderness (also called enthesitis, or inflammation of tendons and ligaments)
• Morning stiffness duration
• Morning stiffness severity

To give each symptom equal weighting, the mean (average) of the two scores relating to morning stiffness is taken. The resulting 0 to 50 score is divided by 5 to give a final 0 – 10 BASDAI score. Scores of 4 or greater suggest suboptimal control of disease, and patients with scores of 4 or greater are usually good candidates for either a change in their medical therapy or for enrollment in clinical trials evaluating new drug therapies directed at Ankylosing Spondylitis.

from:http://www.basdai.com/

上面是“bath强直性脊柱炎活动性指数标准”。强直性脊柱炎患者可以到这里评定疾病的活动性。其中Medication项中的后三项是必须填写的，但对评定的结果并没有影响。Pain on a ten point scale (1 is none and 10 is the worst)中的前五项，按照1-10（1为没有任何问题，10为问题很严重）来评定，第六项是晨僵的时间。填写完毕后，点击Calculate Your Result，即可得出结果。小于4为绿色字体标识，为不活动；大于等于4为活动。