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 (2) Urine (2) Test Area (-) Drugs of Abuse (1) Test Category Alcohols (1) Analgesics (8) Anesthetics (3) Antianxiety (2) Antiarrhythmics (1) Anticholinergics (1) Antidepressants (4) Antidiabetics (2) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (10) Antihistamines (4) Antihypertensives (4) Antimicrobials (7) Antineoplastics (1) Antipsychotics (5) Antithyroids (1) Antitussives/Cough Suppressants (2) Cholinesterase Inhibitors (1) (-) Depressants (1) Expectorants (1) Hallucinogens (6) Immunosuppressants (3) Mood Stabilizers (1) Muscle Relaxants (3) NMDA Antagonists (1) NPS/Designer Drugs (1) Sedative/Hypnotics (7) Stimulants (2) Volatiles (1) Test Sub-Category Opiates/Opioids (1) Test Test Name 2276B Heroin Metabolites - Free (Unconjugated), Blood