Skip to content

Gamma-glutamyl transferase (GGT) in cerebrospinal fluid (CSF)

Published: August 9, 2026Updated: August 16, 2026

This test measures the enzyme GGT in your spinal fluid, which may help assess potential liver or bile duct issues affecting how your brain and nervous system function.

Quick summary

["GGT in CSF can signal conditions impacting liver health or nerve function, though results alone don’t diagnose specific problems."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
72420-3
Short code
GABA. free CSF-sCnc
Synonyms
GABA. free CSF-sCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like headaches, vision changes, or neurological concerns that could relate to liver dysfunction or metabolic disorders. It’s sometimes used alongside other tests to evaluate conditions like meningitis, encephalitis, or inherited metabolic diseases.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your lower back to collect spinal fluid. The procedure is quick but may cause mild discomfort. You’ll lie still for a few minutes afterward to prevent leakage.

What the Results Mean

Elevated GGT in CSF could indicate inflammation, infection, or metabolic disorders affecting nerve cells. However, normal results don’t rule out other conditions. Your doctor will interpret results in context with your symptoms and other tests.

Common Conditions Monitored

This test is less commonly used than blood GGT but may help diagnose conditions like Wilson’s disease, certain types of meningitis, or metabolic encephalopathies where liver enzymes spill into spinal fluid.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Limited but Diagnostic Role

Short name

CSF GGT

Frequently asked questions

What causes elevated GGT in CSF?
Elevated GGT in CSF can result from liver disease (e.g., cirrhosis), bile duct obstruction, or certain infections (e.g., viral meningitis). It may also appear in metabolic disorders like porphyria or hereditary disorders affecting amino acid metabolism. However, most CSF GGT elevations are due to indirect liver or bile duct dysfunction.
How does CSF GGT differ from blood GGT?
CSF GGT measures the enzyme in spinal fluid, which can reflect nerve cell health or inflammation. Blood GGT (measured in serum/plasma) primarily assesses liver function. While both enzymes share similar biological roles, CSF GGT is rarely ordered alone and is often part of a broader diagnostic workup.
Can diet or medications affect CSF GGT?
No, CSF GGT is not typically influenced by diet or common medications. Since it’s a spinal fluid test, it reflects direct metabolic or inflammatory processes in the central nervous system rather than systemic factors.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy