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) (2) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (14) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (31) Sample Type Blood (1) (-) Serum or Plasma (1) (-) Urine (1) Test Area Drugs of Abuse (5) Impairment (2) Postmortem (2) (-) Therapeutics (2) Test Category Sedative/Hypnotics (2) Test Sub-Category Barbiturates (2) Test Test Name 8633SP Phenobarbital, Serum/Plasma 8633U Phenobarbital, Urine