Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (1) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (6) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (15) Sample Type Blood (1) Serum or Plasma (1) (-) Urine (1) Test Area Drugs of Abuse (5) Impairment (2) Postmortem (3) (-) Therapeutics (1) Test Category Sedative/Hypnotics (1) Test Sub-Category Barbiturates (1) Test Test Name 8633U Phenobarbital, Urine