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Joint fluid culture

Culture - joint fluid

 

Joint fluid culture is a laboratory test to detect infection-causing germs in a sample of fluid surrounding a joint.

How the Test is Performed

 

A sample of joint fluid is needed. This may be done in a doctor's office using a needle, or during an operating room procedure. Removing the sample is called joint fluid aspiration.

The fluid sample is sent to a laboratory. There, it is placed in a special dish and watched to see if bacteria, fungi, or viruses grow. This is called a culture.

If these germs are detected, other tests may be done to further identify the infection-causing substance and determine the best treatment.

 

How to Prepare for the Test

 

Your health care provider will tell you how to prepare for the procedure. No special preparation is needed. But, tell your provider if you're taking a blood thinner, such as aspirin, warfarin (Coumadin) or clopidogrel (Plavix). These medicines can affect test results or your ability to take the test.

 

How the Test will Feel

 

Sometimes, the provider will first inject numbing medicine into the skin with a small needle, which will sting. A larger needle is then used to draw out the synovial fluid.

This test may also cause some discomfort if the tip of the needle touches bone. The procedure usually lasts less than 1 to 2 minutes.

 

Why the Test is Performed

 

Your provider may order this test if you have unexplained pain and inflammation of a joint or a suspected joint infection.

 

Normal Results

 

The test result is considered normal if no organisms (bacteria, fungi, or viruses) grow in the laboratory dish.

 

What Abnormal Results Mean

 

Abnormal results are a sign of infection in the joint. Infections may include:

  • Bacterial arthritis
  • Fungal arthritis
  • Gonococcal arthritis
  • Turberculous arthritis

 

Risks

 

Risks of this test include:

  • Infection of the joint -- unusual, but more common with repeated aspirations
  • Bleeding into the joint space

 

 

References

El-Gabalawy HS. Synovial fluid analyses, synovial biopsy, and synovial pathology. In: Firestein GS, Budd RC, Gabriel SE, McInnes IB, O'Dell JR, eds. Kelly and Firestein's Textbook of Rheumatology. 10th ed. Philadelphia, PA: Elsevier; 2017:chap 53.

Karcher DS, McPherson RA. Cerebrospinal, synovial, serous body fluids, and alternative specimens. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St Louis, MO: Elsevier; 2017:chap 29.

Text only

 
  • Joint aspiration

    Joint aspiration - illustration

    Synovial fluid analysis is a series of tests performed on synovial (joint) fluid to help diagnose and treat joint-related abnormalities. To obtain a synovial fluid sample, a needle is inserted into the knee between the joint space. When the needle is in place the synovial fluid is then withdrawn. The sample is sent to the lab for analysis.

    Joint aspiration

    illustration

    • Joint aspiration

      Joint aspiration - illustration

      Synovial fluid analysis is a series of tests performed on synovial (joint) fluid to help diagnose and treat joint-related abnormalities. To obtain a synovial fluid sample, a needle is inserted into the knee between the joint space. When the needle is in place the synovial fluid is then withdrawn. The sample is sent to the lab for analysis.

      Joint aspiration

      illustration

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          Review Date: 12/1/2018

          Reviewed By: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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