Synovial Fluid for AFB Smear/ZN Stain

Specimen Required

FLUID (All Body Fluid)

Fasting Required

Purpose of the Test

The Synovial Fluid for AFB Smear/ZN Stain test is done to detect the presence of acid-fast bacilli (AFB) in synovial fluid, which is the lubricating fluid found in joints. This test helps diagnose tuberculosis and other infections that may affect the joints.

When this test is required

This test is typically requested by a doctor if a patient is experiencing joint symptoms that suggest an infection or if there is a concern for tuberculosis. The test may also be ordered if a patient has been exposed to someone with tuberculosis or has a history of the disease.

What the Test Detects

The Synovial Fluid for AFB Smear/ZN Stain test is used to detect the presence of acid-fast bacilli (AFB) in synovial fluid, which is the lubricating fluid found in joints. AFB are a type of bacteria that are difficult to stain and require special techniques for detection.

Preparation for the Test

No specific test preparation is required for this test. However, patients should inform their doctor if they are taking any medications or have any medical conditions that may affect the test results. It is important to follow the doctor’s instructions regarding any medications that may need to be stopped before the test.

Sample Requirements

A sample of synovial fluid is required for this test. The sample is collected through a needle inserted into the joint. The procedure is called a joint aspiration or arthrocentesis. The synovial fluid is then sent to a laboratory for analysis.

Additional Notes

It is important to note that a negative test result does not completely rule out the presence of tuberculosis or other joint infections. Additional tests may be necessary to confirm a diagnosis. The Synovial Fluid for AFB Smear/ZN Stain test is a minimally invasive procedure that carries a low risk of complications. However, patients should inform their doctor if they have any bleeding disorders or are taking blood-thinning medications, as these may increase the risk of bleeding during the procedure. It is also important to follow the doctor’s instructions regarding any medications that may need to be stopped before the test.

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