Caution: There are a huge number of labs in rheumatology, but especially with low-titer ANA and lowish-titer ribonucleoprotein, nobody's going to make the call of mixed connective tissue disease or anything else without a strongly supportive history and physical exam. Whenever arthritis is a consideration, a good trusting relationship with a rheumatologist is your best asset.
Answered 6/10/2014
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