Quantitative colorimetric assay. This kit is for the detection of Rat Rheumatoid Factor. No significant cross-reactivity or interference between Rheumatoid Factor and analogs was observed. This claim is limited by existing techniques therefore cross-reactivity may exist with untested analogs. Sample types: plasma, serum. Range: 5 - 100 IU/ml. Precision: Intra-Assay: CV%<9% Inter-Assay: CV%<10%. Time: 1.5 hours