2nd order laboratory parameters – depending on the results of the history, physical examination and obligatory laboratory parameters – for differential diagnostic clarification.
- Joint puncture with bacteriological, microscopic and chemical/immunological examination.
- Inflammatory parameters – CRP (C-reactive protein) – if arthritis is suspected.
- Uric acid in blood serum / joint punctate.
- Rheumatism diagnostics – ESR (blood sedimentation rate), cyclic citrulline peptide antibodies (CCP-AK), rheumatoid factor.