This is a rheumatology decision tool.
Rheumatoid Arthritis Likelihood Decision Tool
See also the 2010 American College of Rheumatology/European League Against Rheumatism Criteria calculator
Begin with patient with undifferentiated arthritis
Findings:
1. Age
(.02 points per year)
2. Gender

3. Distribution of joints (patient may have more than one item)
< Small joints of the hands or feet
<-- Other locations
<-- Symmetrical
4. Score of morning stiffness on a 100-mm visual analog scale (0-100)

5. Number of tender joints

6. Number of swollen joints

7. C-reactive protein range

8. Rheumatoid Factor test

9. Anticyclic citrullinated peptide antibody test

Score --> numberscore1=(((age)*(.02))+(gender)+(dist1)+(dist2)+(dist3)+(tender)+(swollen)+(crp)+(rf)+(ccp)).toFixed(2) points
Likelihood ratio and recommendation --> interpretationscore2=((age)*(.02))+(gender)+(dist1)+(dist2)+(dist3)+(tender)+(swollen)+(crp)+(rf)+(ccp);score2>8.5?'likelihood ratio 12.7 - 85% of patients with these findings diagnosed with RA at the 1 year mark - refer to rheumatologist for evaluation and consideration of DMARD therapy':score2>6.5?'likelihood ratio 3.0 - 57% of patients with these findings diagnosed with RA at the 1 year mark - refer to rheumatologist for evaluation and consideration of DMARD therapy':score2>3.5?'likelihood ratio 0.42 - 16% of patients with these findings diagnosed with RA at the 1 year mark':'likelihood ratio 0 - 0% of patients with these findings diagnosed with RA at the 1 year mark'
display/hide references

Result - Copy and paste this output: