Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
Draining fluid can also relieve pressure and pain.
Why it's done
- A hot, swollen joint
- Possible gout, pseudogout, or joint infection
Getting ready and what happens
- Tell your provider about blood thinners.
How the test is done
- The skin is numbed, and a needle draws fluid from the joint.
What the results mean
Crystals
Needle-shaped crystals mean gout; rhomboid ones mean pseudogout.
Many white cells or bacteria
Suggests joint infection, which is an emergency.
When a result needs quick action
Call your provider todayA hot, swollen joint with fever
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
Mild pain, bruising, or rarely infection at the needle site.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.