I found a comprehensive list of diagnostic criteria for RA developed by the American College of Rheumatology in 1988. According to the association these are still used to diagnose rheumatoid arthritis.
There are seven criteria:,
1. Morning stiffness > 1 hour
2. Arthritic changes in three or more joint areas on this list:
middle joint of the fingers,
the knuckles
wrist,
elbow,
knee,
ankle,
toe/foot joint
3. Arthritis in multiple hand joints: (wrist, knuckles, finger joints)
4. Symmetrical joint swelling with the following pattern:
swelling of the same joint bilaterally
or
Bilateral swelling of the joints, but not necessarily the same joint on both sides
and affecting the following joints:
middle joint of the fingers, the knuckles, and/or the joint between the toes and the foot
5. Nodules under the skin over pressure points or bone protrusions
6. Positive RF (rheumatoid factor) test
7. Decalcified areas of (more porous) bone or uneven patches of bone erosion around the joints affected by RA. (osteoporosis or universally thinning bones throughout the body do not qualify)
Criteria 1 through 4 must have been present for at least 6 weeks to be considered significant, and four criteria total must be present to diagnose RA. I emailed the association to find out if anti-CCP has been added to, or replaced RF on the cinerea list.
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