Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Sample Type Blood (1) Fluid (2) Serum or Plasma (1) (-) Urine (1) Test Area Drugs of Abuse (1) Test Category Antiepileptics/Antiseizures (1) Antihypertensives (1) Antimicrobials (1) (-) Depressants (1) Expectorants (1) Metals/Elements (3) Solvents (1) Test Sub-Category Other (1) Test Test Name 9326U Gamma-Hydroxybutyric Acid Screen, Urine