Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (2) Enzyme-Linked Immunosorbent Assay (ELISA) (5) Enzyme Immunoassay (EIA) (2) Gas Chromatography (GC) (8) Headspace Gas Chromatography (GC) (8) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (5) Sample Type Blood (1) Serum or Plasma (1) Urine (3) Test Area (-) Drugs of Abuse (3) (-) Exposure (2) Therapeutics (35) Test Category Acids (2) Depressants (3) Test Sub-Category Carboxylic Acids (2) Opiates/Opioids (3) Test Test Name 2276B Heroin Metabolites - Free (Unconjugated), Blood 2276SP Heroin Metabolites - Free (Unconjugated), Serum/Plasma 2276U Heroin Metabolites - Free (Unconjugated), Urine 2300U Hippuric Acid, Urine 2306U Hippuric Acid and Methylhippuric Acid, Urine