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Synovial fluid analysis How the Test is Performed:
Normal synovial fluid is a clear or pale-yellow fluid found in small amounts in joints,
bursae, and tendon sheaths. To obtain the fluid for analysis, a sterile needle is inserted into the joint space. In the laboratory, the fluid is analyzed for color, clarity, quantity, and other factors. It is examined microscopically for formed elements (such as cells), bacteria, and chemical analysis.
How to Prepare:
Fasting 6 to 12 hours before the test is sometimes required if glucose is to be analyzed. You must sign a consent form.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How it Feels:
You will be given local anesthesia. There is usually transient pain when the needle enters the joint capsule.
Risks:
Why this Test is Performed:
The test is performed to identify the cause of swelling in the joints, to diagnose certain types of arthritis and inflammatory joint diseases, and to relieve pain and distention from fluid accumulation in the joint.
Normal Values:
The ranges for chemical analysis, blood cell counts, pH, and protein are normal.
Abnormal Results:
Abnormal results may indicate arthritis of traumatic origin, osteoarthritis , rheumatoid arthritis , septic arthritis , acute gouty arthritis (Gout) , chronic gouty arthritis , or inflammatory diseases.
Cost:
The estimated cost is $62.
Special Considerations:
Ice or cold packs may be applied to the joint for 24 to 36 hours after the test to reduce the swelling and joint pain . You can resume normal activity after the procedure, but avoid excessive use of the joint.
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