Skip to content

GABA (Gamma-Aminobutyric Acid) in Plasma

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

This test measures the amount of GABA, a natural chemical in your blood that helps regulate brain activity.

Quick summary

["GABA is a key neurotransmitter that calms nerve signals in your brain."]

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

Key facts at a glance

LOINC
90826-9
Short code
GABABR Ab Titr CSF CBA IFA
Synonyms
GABABR Ab Titr CSF CBA IFA
Category
coagulation
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cba-ifa
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is GABA?

GABA stands for gamma-aminobutyric acid, a neurotransmitter produced naturally in your body. It plays a critical role in reducing nerve cell activity, helping to promote relaxation and reduce anxiety. Your brain and nervous system rely on GABA to maintain balance and proper function.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like seizures, anxiety, insomnia, or neurological conditions. It can also be part of evaluating conditions affecting GABA levels, such as certain brain disorders or metabolic issues.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The plasma portion is then analyzed to measure GABA concentration using a specialized laboratory method.

What Do Results Mean?

Results are not typically provided as a single reference range since GABA levels can vary based on health, diet, and other factors. Your doctor will interpret the result in relation to your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GABA Level

Frequently asked questions

How often will I need this test?
This test is usually not routine and is performed only when symptoms or medical concerns suggest abnormal GABA levels. Follow your doctor’s guidance on frequency.
Can I prepare for this test?
No special preparation is needed, but avoid heavy meals before the blood draw to ensure accurate results.
What are the possible risks or side effects?
The most common side effect is mild bruising or discomfort at the injection site. Rarely, there may be a slight reaction to the needle.
  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