Rheumatoid Factor and Its Interference with Cytokine Measurements: Problems and Solutions

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td align="left">Analyte</td><td align="center">Ratio spiked sample precipitated : sample matrix precipitated, then spiked mean ± SD</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td align="left">IL-1<i>β</i></td><td align="center">0.94 ± 0.15</td></tr><tr><td align="left">IL-4</td><td align="center">1.01 ± 0.14</td></tr><tr><td align="left">IL-6</td><td align="center">0.95 ± 0.16</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Ratio of cytokine concentrations measured from samples spiked with cytokine and then PEG-precipitated and samples which were PEG-precipitated and then spiked with cytokine. Mean ± SD given.

Arthritis

tab4

Table 4

Table 4: Rheumatoid Factor and Its Interference with Cytokine Measurements: Problems and Solutions 