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Tests and diagnosis
By Mayo Clinic staffThe following tests typically help diagnose septic arthritis:
- Joint fluid analysis. To discover exactly what bacterium is causing your infection, your doctor takes a sample of the fluid within your joint (synovial fluid). He or she extracts the synovial fluid through a needle (aspiration) that's inserted into your joint. Synovial fluid normally appears clear and thick. Bacterial infections can alter the color, consistency, volume and makeup of the synovial fluid. Your doctor examines the synovial fluid and then sends the fluid to a lab for analysis, including tests to determine what organism is causing your infection.
- Blood tests. Your doctor may order blood tests to see if bacteria are present in your bloodstream.
- Imaging tests. X-rays and other imaging tests of the affected joint also may be ordered to assess any damage to the joint.
