However, a general workup includes, but is not limited to, complete blood count with differential, comprehensive metabolic panel, urinalysis with sediments, antinuclear antibody (ANA), rheumatoid factor (RF), thyroid stimulating hormone, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), serum protein electrophoresis, complement levels, cryoglobulins, antiphospholipid antibodies, and viral hepatitis serologies, particularly hepatitis C. Here, CRP is linked to hepatitis C virus infection.