2nd order laboratory parameters – depending on the results of the history, physical examination, etc. – for differential diagnostic clarification.
- Uric acid
- Rheumatoid diagnostics – CRP (C-reactive protein) or ESR (erythrocyte sedimentation rate); rheumatoid factor (RF), CCP-AK (cyclic citrulline peptide antibodies), ANA (antinuclear antibodies).
