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GABA (Gamma-Aminobutyric Acid) in Cerebrospinal Fluid (CSF) by Mass Concentration

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

This test measures the amount of GABA, a key brain chemical, in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It may be used to evaluate conditions affecting brain chemistry or detect certain neurological disorders.

Quick summary

["GABA CSF helps assess brain function and potential chemical imbalances."]

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

Key facts at a glance

LOINC
16886-4
Short code
Deprecated GABA CSF-mCnc
Synonyms
Deprecated GABA CSF-mCnc
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 healthcare provider may recommend this test if you have symptoms like seizures, headaches, movement disorders, or neurological issues that suggest abnormal brain chemistry. It could also be part of a broader evaluation for conditions like epilepsy, brain tumors, or metabolic disorders affecting GABA levels.

How the Test Works

A small sample of cerebrospinal fluid is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then analyzed in a lab to measure GABA levels using mass spectrometry, a precise method for detecting chemicals in the body.

What to Expect Before the Test

You may need to fast for a few hours before the test, depending on your provider’s instructions. Wear comfortable clothing and bring any necessary medications. Inform your provider about any medications, allergies, or recent illnesses.

What to Expect During the Test

The procedure involves lying on your side with your back bent. A needle is inserted into your lower back to collect fluid. You may feel a slight pinch, but the procedure is usually quick and painless. You’ll be asked to lie still for a few minutes afterward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

GABA CSF

Frequently asked questions

What Does This Test Tell Us?
Abnormally high or low GABA levels in CSF may indicate neurological conditions such as epilepsy, certain brain tumors, or metabolic disorders. However, results alone may not diagnose a condition without clinical correlation. Your provider will consider symptoms, medical history, and other test results.
How Often Is This Test Done?
This test is typically ordered as part of a specific evaluation for suspected neurological disorders. It’s not a routine screening test and is usually performed only when symptoms or diagnostic concerns suggest it’s needed.
What Are the Risks?
The most common risk is a mild headache or soreness at the injection site, which usually goes away within a few days. Rarely, complications like infection or nerve damage may occur, but serious risks are uncommon with proper medical supervision.
  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