A sample of synovial fluid (the fluid that lubricates the joints) may be removed from a joint. Studies of synovial fluid can help your healthcare provider look for gout or infectious arthritis (including septic arthritis).
Is It Arthritis? -- Or Another Medical Condition
There are conditions besides arthritis that can cause pain or stiffness around joints. Before making an arthritis diagnosis, your healthcare provider will consider these other conditions.
Depending on the type of arthritis, healthcare providers may consider any of the following conditions: