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joint effusion (knee effusion)
Laboratory:
1) joint aspiration for synovial fluid analysis
- synovial fluid cell count
- gram stain
- synovial fluid culture
2) blood cultures* if febrile
3) systemic inflammatory markers may be elevated
- erythrocyte sedimentation rate (ESR)
- serum C-reactive protein (serum CRP)
* special recommendations for prosthetic joints (see infected prosthesis)
Related
joint aspiration (arthrocentesis)
General
effusion