CRP is an abnormal protein produced primarily by the liver during an acute inflammatory process.

The CRP test is a more sensitive and rapidly responding indicator than the erythrocyte sedimentation rate ( VES).

RF are auto-antibodies found in the blood and synovial fluid of rheumatoid arthritis patients.

They may also be elevated in patients with certain autoimmune diseases, such as   SLE.

RF level test is useful with CRP to understand  the possible reasons for recurrent fevers and articulation pain.