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Gamma-Aminobutyric Acid (GABA) in Serum/Plasma

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

This test measures the amount of gamma-aminobutyric acid (GABA), a key neurotransmitter in your brain that helps regulate nerve cell activity.

Quick summary

["GABA helps calm brain activity and may be checked if you have concerns about neurological function or certain conditions."]

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

Key facts at a glance

LOINC
101874-6
Short code
GABAAR IgG Ser Ql CBA IFA
Synonyms
GABAAR IgG Ser Ql CBA IFA
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cba-ifa
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like seizures, anxiety, or sleep disorders. It could also be part of an evaluation for conditions affecting brain chemistry, such as epilepsy or certain brain injuries.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein in your arm, and blood will be drawn into a tube. If you’re concerned about discomfort, let your provider know.

What the Results Mean

GABA levels can vary based on health, medications, and other factors. Your results will be compared to a reference range provided by your lab. Abnormal levels might suggest issues with brain function or neurological disorders.

Common Conditions Monitored

While GABA is important for brain function, abnormal levels are less commonly checked in routine care. It may be used in specialized cases, such as epilepsy monitoring or research studies on brain chemistry.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GABA Level

Frequently asked questions

What might cause this test to be ordered?
Your doctor might order this test if you have symptoms like unexplained seizures, severe anxiety, sleep disturbances, or if you’re being evaluated for a neurological condition. It can also be part of research or specialized diagnostic testing for brain-related disorders.
How long will I need to wait for results?
Results are typically available within a few days to a week, depending on your lab and healthcare provider. Follow-up instructions will be given by your provider.
Can I eat or drink before this test?
No dietary restrictions apply. You can eat and drink normally before the blood draw, unless your provider specifies otherwise.
  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