Gamma-Aminobutyric Acid (GABA) in Plasma or Serum

What Is Gamma-Aminobutyric Acid (GABA)?

Gamma-aminobutyric acid (GABA) is a neurotransmitter, meaning it’s a chemical that transmits signals between brain cells. It plays a key role in reducing nerve cell activity, helping to promote relaxation and reduce anxiety. While GABA is present in many foods and supplements, your body also produces it naturally. Abnormal levels may be linked to certain neurological or psychiatric conditions.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like excessive anxiety, insomnia, seizures, or other neurological concerns. It could also be part of a broader evaluation for conditions such as epilepsy, depression, or other mood disorders. Sometimes, it’s checked in people with brain injuries or those taking medications that affect GABA levels.

How Is the Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The blood is then sent to a lab for analysis using a specialized method to measure GABA concentration. The test typically takes a few days to return results, depending on lab processing times.

What Do the Results Mean?

Results are not always interpreted alone. They are usually reviewed alongside your medical history, symptoms, and other test results. Low or high GABA levels may suggest underlying issues, but further evaluation is needed to determine the cause and next steps.