Gamma-Aminobutyric Acid Measurement true GAMBTAC The determination of the amount of gamma-aminobutyric acid present in a sample. Gamma-Aminobutyric Acid Measurement γ-aminobutyric acid (GABA) levels A measurement of the gamma-aminobutyric acid in a biological specimen. Gamma-Aminobutyric Acid Measurement Laboratory Procedure CDISC C154766 CL555601 GABA https://www.ncbi.nlm.nih.gov/pubmed/20345933 Gamma-aminobutyrate Gamma-Aminobutyric Acid neurotransmitter levels