A 35-year-old male asked:
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Both knee pain since 1.5 yr. MRI OK.Now left hand elbow and finger joints burning.RA factor8.6IU/ml.ESR/RPR/ASO/CRP/uric acid normal.Possible reasons?

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Dr. Saptarshi Bandyopadhyay
20 years experience in Hospital-based practice
Unclear polyarthriti: The RF (Rheumatoid factor) assay -which is, I assume the "RA factor"- varies widely from lab to lab, so I am not sure if 8.6 IU/mL is in the reference range or not (the lab should give both the result and the ref range). It's best to talk to a rheumatologist about your symptoms. It sounds complex. There are forms of arthritis which don't show up on blood tests (seronegative); you may have 1 of tho
Answered on Nov 5, 2015
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