Fungal Culture from Cerebrospinal Fluid (CSF)

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like severe headaches, neck stiffness, confusion, or fever, especially if you’ve had recent surgery, weakened immune system, or exposure to potential fungal sources. It’s also used in people with known fungal infections or conditions like cancer or HIV.

How Is the Test Performed?

A small amount of your cerebrospinal fluid is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then sent to a lab where it’s cultured to grow any fungi that may be present. Results can take several days to weeks to confirm.

What Does the Test Result Mean?

A positive result means fungi were detected in your CSF, which may indicate a fungal infection. A negative result means no fungi were found, but other causes of symptoms (like bacterial infections or inflammation) should still be evaluated. Follow-up tests may be needed based on your symptoms and test results.

What Are Possible Causes of Positive Results?

Positive fungal cultures in CSF are most commonly linked to invasive fungal infections (e.g., cryptococcal meningitis, candidiasis) in people with weakened immune systems, recent central nervous system procedures, or exposure to high-risk environments.