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) (3) Sample Type Blood (1) Serum or Plasma (1) Urine (1) Test Area (-) Drugs of Abuse (3) Newborn Tox (1) Therapeutics (12) Test Category Depressants (3) Test Sub-Category Benzodiazepines (1) Biomarkers (1) (-) Opiates/Opioids (3) Other (28) Synthetic Cathinone (3) Test Test Name 2276B Heroin Metabolites - Free (Unconjugated), Blood 2276SP Heroin Metabolites - Free (Unconjugated), Serum/Plasma 2276U Heroin Metabolites - Free (Unconjugated), Urine