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) (1) Sample Type Blood (1) (-) Serum or Plasma (1) Urine (2) Test Area (-) Drugs of Abuse (1) Therapeutics (1) Test Category Alcohols (1) (-) Depressants (1) Hallucinogens (6) NPS/Designer Drugs (1) Stimulants (1) Test Sub-Category Opiates/Opioids (1) Test Test Name 2276SP Heroin Metabolites - Free (Unconjugated), Serum/Plasma