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) (3) Sample Type Blood (3) Serum or Plasma (2) (-) Tissue (1) (-) Urine (3) Test Area Therapeutics (4) Test Category Analgesics (3) (-) Anesthetics (1) Antianxiety (1) Antidepressants (5) Antihypertensives (1) Metals/Elements (2) NPS/Designer Drugs (3) (-) Opiate/Opioid Antagonists (3) Sedative/Hypnotics (1) Solvents (3) Stimulants (3) Test Sub-Category Other (4) Test Test Name 3111U Naloxone - Total (Conjugated/Unconjugated), Urine 3113U Naloxone - Total (Conjugated/Unconjugated) Screen, Urine 3116U Naltrexone and Metabolite - Total (Conjugated/Unconjugated), Urine 3214TI Nitrous Oxide, Tissue