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False-positive semiquantitative immunochromatography assays for procalcitonin in three patients with rheumatoid
Hiroe Sato1, Satoshi Ito2, Kiyoshi Nakazono2
1Niigata University Health Administration Center Niigata City Japan.
Abstract:
We report three rheumatoid arthritis (RA) patients with false-positive procalcitonin (PCT) based on semiquantitative immunochromatography assays without infection, but who had negative PCT assay results based on quantitative methods. Immunochromatography was useful for screening; however, other heterophilic antibodies rather than rheumatoid factor were possible to affect, especially in RA flare.
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