Joint fluid culture
Key points
- Joint fluid culture is a laboratory test to isolate and identify organisms that cause infection, performed on a specimen of fluid obtained from fluid around a joint.
- A sample of joint aspirate or fluid is removed from the joint with a needle or in the operating room, then is placed on culture media in containers for the purpose of growing microorganisms (bacteria, fungus, or viruses) in the laboratory.
- The preparation you can provide for this test depends on your child's age, previous experiences, and level of trust.
- The sample may be obtained in the health care provider's office or in the hospital.
Alternative names
Culture - joint fluid (aspirate)
Definition
Joint fluid culture is a laboratory test to isolate and identify organisms that cause infection, performed on a specimen of fluid obtained from fluid around a joint. See also Synovial fluid analysis.
How the test is performed
A sample of joint aspirate or fluid is removed from the joint with a needle or in the operating room, then is placed on culture media in containers for the purpose of growing microorganisms (bacteria, fungus, or viruses) in the laboratory.
The microbiologist in the laboratory inspects the cultures daily for growth. If microorganisms are detected, other tests may be initiated to identify the infectious agent and determine the sensitivity of the organisms to medications. Antibiotic therapy can then be determined based on these results.
How to prepare for the test
A physician will withdraw fluid from a joint.
Infants and children:
The preparation you can provide for this test depends on your child's age, previous experiences, and level of trust. For general information regarding how you can prepare your child, see the following topics:
- Infant test or procedure preparation (birth to 1 year)
- Toddler test or procedure preparation (1 to 3 years)
- Preschooler test or procedure preparation (3 to 6 years)
- School age test or procedure preparation (6 to 12 years)
- Adolescent test or procedure preparation (12 to 18 years)
How the test will feel
The sample may be obtained in the health care provider's office or in the hospital. The skin over the joint is cleansed with antibacterial soap. A local anesthetic may be injected into the skin over the joint. The injection may burn or sting.
After the area has become numb, a larger needle is inserted into the joint, and fluid is withdrawn. There may be pressure in the joint. Some minor soreness may be present for several days.
Written and revised by
Andrey Nailor, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.