Back To Classification Criteria
RA Subsets
1. Arthritis of 3 or more joint areas and positive findings on hand radiographs
2. Arthritis of
3 or more joints and serum rheumatoid factor-positive; negative findings
on hand radiographs
4. Arthritis of
3 or more joint areas including MCP and wrist joints; serum rheumatoid
factor-negative and negative findings on hand radiographs
5. Arthritis involving
a single joint area symmetrically and serum rheumatoid factor-positive
6. Oligoarthritis
of MCP or wrist joints and serum rheumatoid factor-positive
Non RA Subsets
3. Arthritis of
3 or more joint areas, specifically not involving MCP and wrist
joint areas; serum rheumatoid factor-negative and negative findings
on hand radiographs
7. Seropositive,
but asymmetric oligoarthritis not involving wrist or MCP joint
areas
8. Seronegative
oligoarthritis
* See Table 3 for definitions
of abbreviations. Missing data rules: If radiographs are not available, substitute
MCP swelling; if results of tests for rheumatoid factor are not available, substitute
wrist swelling; if the clinical data from routine tests are not available, the
patient's disease cannot be classified.
+ These subset numbers also appear under the subset boxes
in Figure 1.
