Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (2) Enzyme Immunoassay (EIA) (1) (-) 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) Test Category Acids (2) Analgesics (13) Anticholinergics (3) Antihistamines (4) Antihypertensives (3) Antimicrobials (5) Antipsychotics (5) (-) Depressants (3) Hypoglycemic Agents (2) Test Sub-Category 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