Rheumatoid Factor, IgM by EIA (RDL)

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Turnaround Time: 5-7 Days
CPT Code:


Test Type: 1 mL Serum


Use: EIA methods have the added advantage of being able to simultaneously detect RF of IgG and IgA subclasses in addition to RF IgM and are not susceptible to prozone. It has become apparent that the specificity and predictive value of the RF test is substantially increased by the detection of all three RF isotypes.

Methodology: Enzyme-linked immunosorbent assay (ELISA)

Collection Details:

Collection Instructions:

Specimen: Serum

 Volume: 1 mL

Minimum Volume: 0.3 mL (Note: This volume does not allow for repeat testing.)

Container: Red-top tube or gel-barrier tube

Collection: Separate serum from cells within one hour of collection. Transfer to a plastic transport tube before shipping. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions: Refrigerate or freeze.