2nd-order laboratory parameters-depending on the results of the history, physical examination, and obligatory laboratory parameters-for differential diagnostic clarification.
- Small blood count
- Inflammatory parameters – CRP (C-reactive protein) or ESR (erythrocyte sedimentation rate).
- Serum electrophoresis
- Immunoelectrophoresis
- Cold agglutination
- Cryoglobulins
- Antinuclear antibodies (ANA)
