You are seeing a 4-year old girl who has a 6-week history of recurrent left knee pain and a limp. On examination, the joint is red, warm and tender but she is able to weight bear with a limp. Of the...

You are seeing a 4-year old girl who has a 6-week history of recurrent left knee pain and a limp. On examination, the joint is red, warm and tender but she is able to weight bear with a limp. Of the following, this girl is MOST LIKELY to test positive for:


a. Anti-nuclear antibody
b. Rheumatoid factor
c. Anti-double stranded DNA antibody
d. Anti-streptolysin O antibody