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GABA (Gamma-Aminobutyric Acid) in Serum/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 levels may help assess brain function or identify certain neurological conditions."]

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

Key facts at a glance

LOINC
2317-6
Short code
GABA SerPl Ql
Synonyms
GABA SerPl Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms like seizures, anxiety, or neurological disorders. It can also be part of investigations for conditions affecting brain chemistry or metabolic disorders.

What to Expect Before the Test

No special preparation is needed. You may have blood drawn from a vein in your arm, similar to other blood tests. If you’re on blood thinners, let your provider know.

What the Results Mean

Results are not typically provided as a single numeric range since GABA levels can vary widely based on factors like diet, stress, or medications. Your provider will interpret the result in relation to your symptoms and medical history.

Common Conditions Monitored

Elevated or low GABA levels may be linked to conditions like epilepsy, neurological disorders, or metabolic imbalances. However, GABA is also influenced by lifestyle and medications, so results should be reviewed by a healthcare professional.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GABA Level

Frequently asked questions

What causes abnormal GABA levels in the blood?
Abnormal GABA levels can result from neurological disorders (e.g., epilepsy), certain medications, metabolic conditions, or stress. Some people may also have naturally lower or higher baseline levels due to genetics or lifestyle factors.
How long does it take to get results?
Test results are typically available within 1–3 business days, depending on your lab’s processing time. Your provider will contact you with the final interpretation.
Can diet or supplements affect GABA levels?
Yes, diet (e.g., foods rich in GABA like fermented foods) and certain supplements (e.g., GABA supplements) may influence GABA levels. Avoid taking GABA-containing supplements before testing unless directed by your provider.
  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