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) Test Category Acids (1) Alcohols (4) Biomarkers (1) (-) Depressants (1) Emetics (1) Gases (1) Hallucinogens (6) Herbicides (1) Metals/Elements (14) NPS/Designer Drugs (1) Pesticides/Insecticides (3) Solvents (6) Stimulants (1) Volatiles (15) Test Sub-Category Opiates/Opioids (1) Test Test Name 2276B Heroin Metabolites - Free (Unconjugated), Blood