Gamma-Aminobutyric Acid (GABA) in Plasma/Serum
This test measures the amount of gamma-aminobutyric acid (GABA), a key neurotransmitter in the brain that helps regulate nerve cell activity.
["GABA levels may be checked to assess brain function or investigate neurological symptoms."]
Key facts at a glance
- LOINC
- 26804-5
- Short code
- GABA 24h Ur Ql
- Synonyms
- GABA 24h Ur Ql
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- 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, anxiety, or movement disorders. It could also be part of a broader evaluation for conditions affecting brain chemistry or metabolic processes.
What to Expect Before the Test
No special preparation is typically needed. If blood is drawn, you may experience a slight pinch, but it usually doesn’t cause long-term discomfort. If urine is collected, follow any instructions to ensure accurate results.
What the Results Mean
GABA levels can vary based on health, diet, medications, and other factors. Abnormal results may prompt further testing or evaluation by a specialist, such as a neurologist or psychiatrist.
Common Conditions Monitored
GABA levels are sometimes checked in people with epilepsy, autism spectrum disorder, or other neurological conditions where GABA’s role is suspected. It may also be part of research or specialized diagnostic protocols.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
GABA is the primary inhibitory neurotransmitter in the brain, helping to calm nerve activity. Low GABA levels may be linked to conditions like epilepsy or anxiety, while high levels could indicate metabolic disorders or certain brain injuries. However, GABA testing alone is rarely definitive—results are often interpreted alongside clinical findings and other tests.
Short name
GABA Level
Frequently asked questions
What does a low or high GABA level indicate?
How is GABA tested in the blood or urine?
Can diet or medications affect GABA levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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