Rheumatoid Factor (IgM) ≥95%

Purified Rheumatoid Factor (IgM) antigen from Antibodies.com is a ≥95% pure liquid reagent supplied in a 250 µl vial format. The IgM isotype autoantibody recognizes the Fc portion of human immunoglobulin G and serves as a reference standard for autoimmune serology workflows. Researchers apply this antigen in ELISA plate-coating protocols, immunonephelometric calibration curves, and latex agglutination controls during rheumatoid arthritis assay development. The liquid preparation is stored at -20°C and tolerates standard freeze-thaw handling when aliquoted, supporting reproducible inter-lot benchmarking of RF-IgM screening panels. It is intended for research use only and is suited to confirm specificity against pooled polyclonal IgG substrates in diagnostic kit validation studies.