Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (4) Sample Type (-) Blood (2) (-) Serum or Plasma (2) Urine (3) Test Area Therapeutics (4) Test Category Anesthetics (1) Antidepressants (2) Antidiabetics (2) Industrial/Environmental Toxins (2) NPS/Designer Drugs (6) (-) Opiate/Opioid Antagonists (4) Other (1) Stimulants (4) Therapeutics (1) Vasodilators (2) Test Sub-Category (-) Other (4) Test Test Name 3111B Naloxone - Free (Unconjugated), Blood 3111SP Naloxone - Free (Unconjugated), Serum/Plasma 3116B Naltrexone and Metabolite - Free (Unconjugated), Blood 3116SP Naltrexone and Metabolite - Free (Unconjugated), Serum/Plasma