Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (2) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (1) Refractometer (REF) (2) Sample Type (-) Urine (1) Test Area Exposure (1) Test Category Analgesics (2) Anesthetics (2) Antianxiety (1) Antiarrhythmics (1) Anticholinergics (3) Antidepressants (4) Benzodiazepines (1) Depressants (2) Muscle Relaxants (1) NPS/Designer Drugs (2) Plasticizers (1) Sedative/Hypnotics (4) Stimulants (1) (-) Volatiles (1) Test Sub-Category Other (1) Test Test Name 0556U Benzidine, Urine