Synovial Fluid for Bacterial C/S (Aerobic) with Gram Stain

Specimen Required

FLUID (All Body Fluid)

Fasting Required

Purpose of the Test

A synovial fluid bacterial culture and gram stain test is ordered when someone has symptoms of joint inflammation or infection such as joint pain, swelling, redness, warmth, and stiffness. It is used to help diagnose the cause of the symptoms and determine if there is a bacterial infection present in the joint.

When this test is required

The test is typically ordered when someone has symptoms of joint inflammation or infection, particularly if the symptoms are severe or persist for a long time.

What the Test Detects

The test is designed to detect the presence of bacteria in synovial fluid, which may indicate a bacterial infection in the joint. The test involves placing a sample of synovial fluid on a culture medium to see if bacteria grow. A gram stain is also performed on the sample to help identify the type of bacteria present.

Preparation for the Test

There is typically no special preparation required for the test. However, the healthcare provider may instruct the patient to stop taking certain medications, particularly those that can affect blood clotting, prior to the test.

Sample Requirements

The test requires a sample of synovial fluid, which is the fluid that surrounds and lubricates joints.

Additional Notes

Other tests, such as white blood cell count, may also be ordered along with the synovial fluid culture and gram stain test to help diagnose joint infections. It is important to follow the healthcare provider’s instructions regarding medication use and any other preparations needed for the test.

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