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) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type (-) Blood (2) Fluid (1) Serum or Plasma (2) Urine (2) Test Area Drugs of Abuse (1) Therapeutics (1) Test Category Cholinesterase Inhibitors (1) (-) Depressants (1) (-) Expectorants (1) Sedative/Hypnotics (2) Solvents (1) Test Sub-Category (-) Other (2) Test Test Name 2185B Guaifenesin, Blood 9326B Gamma-Hydroxybutyric Acid Screen, Blood