Cerebrospinal Fluid (CSF) Gamma-Glutamyl Transferase (GGT) Activity

Your doctor may order this test to help investigate unexplained neurological symptoms, such as persistent headaches, seizures, confusion, memory problems, or changes in behavior. Measuring GGT in CSF can provide important clues about conditions affecting the brain and spinal cord and help guide further evaluation and treatment decisions.

Your healthcare provider may request this test if you have symptoms like headaches, neurological issues, or if they suspect conditions such as meningitis, encephalitis, or other inflammatory or infectious processes in the central nervous system. It may also be used as part of a broader evaluation for conditions like multiple sclerosis or other demyelinating diseases.

This test requires a lumbar puncture, also called a spinal tap, to collect a sample of cerebrospinal fluid. Before the procedure, tell your care team about all medications you take, especially blood thinners, and mention any allergies or bleeding disorders. You may be asked to empty your bladder and lie still during the collection, which usually takes only a short time.

You will likely have a lumbar puncture (spinal tap) performed by a healthcare professional. This involves inserting a needle into your lower back to collect a small sample of CSF. You may feel pressure or discomfort, but it is generally well-tolerated. Avoid alcohol for 24 hours before the procedure to help ensure accurate results.

Results are interpreted alongside your symptoms, imaging studies, and other laboratory findings. A normal GGT level in CSF generally suggests no abnormal enzyme activity in the fluid surrounding your brain and spinal cord. An elevated level may point to inflammation, infection, injury, or certain tumors, and your provider will explain what your specific values mean and whether additional testing is needed.

While elevated GGT levels in CSF can sometimes suggest inflammation or infection, this test alone is not definitive. Results are often interpreted alongside other clinical findings, symptoms, and possibly additional tests. Your provider will discuss the meaning of your specific results with you.

This test may be used when monitoring conditions such as central nervous system infections, including meningitis and encephalitis, brain or spinal cord tumors, demyelinating diseases like multiple sclerosis, subarachnoid hemorrhage, and other disorders that cause inflammation or damage within the brain and spinal cord.

This test is less commonly used for monitoring chronic conditions but may be part of an initial evaluation for acute neurological concerns. Conditions like viral meningitis, bacterial infections, or autoimmune diseases affecting the central nervous system could be under investigation.