24-Hour Urine Concentration of Gamma-Aminobutyric Acid (GABA)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if they suspect an imbalance in GABA-related brain chemistry, particularly in conditions like epilepsy, autism spectrum disorders, or other neurological studies. It may also be part of a broader evaluation for metabolic or genetic disorders affecting neurotransmitter levels.

What to Expect Before the Test

You’ll need to collect all urine produced in a 24-hour period in a special container. Typically, this starts after midnight and ends the same day midnight arrives. Drink plenty of fluids to ensure full collection, but avoid foods or supplements that might interfere with GABA measurement unless instructed otherwise.

What Happens During the Test

After collecting the urine sample, it will be sent to a lab for analysis using a specialized method to measure GABA concentration. The lab will process the sample and provide results to your healthcare provider.

What the Results Mean

Results are typically reported as a concentration value (e.g., micrograms per milliliter or milligrams per day). While reference ranges can vary by lab, abnormal results may indicate conditions affecting GABA metabolism or neurological function. Your provider will interpret results in the context of your overall health and symptoms.