Autoimmune rapid devices are a growing range of kits to help diagnose common Autoimmune conditions like rheumatoid arthritis. Rapid Labs  Rheumatoid Factor (RF)  test kit is a Whole Blood/ Serum/Plasma assay for Professional use only giving fast screening results in a convenient near to patient format.  The RF test kit  can be used in combination with the Rapid Labs CRP tests. in Rapid, Elisa and latex format.