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Tandem assays may help to diagnose rheumatoid arthritis

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Combining two assays for rheumatoid factor (RF) may improve the diagnosis of rheumatoid arthritis (RA), according to the first study to measure performance of commercial test kits for IgM or IgA RF.

Three IgM kits and two IgA kits with superior sensitivity, specificity, and agreement in an initial screening failed …

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