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) (3) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (2) Refractometer (REF) (2) Sample Type Urine (1) Test Area (-) Exposure (1) Test Category Analgesics (7) Anesthetics (6) Antianxiety (3) Antiarrhythmics (3) Anticholinergics (7) Antidepressants (9) Antiepileptics/Antiseizures (2) Antineoplastics (1) Antipsychotics (1) Antithrombotics (3) Depressants (6) Diuretics (2) Muscle Relaxants (4) Plasticizers (2) Sedative/Hypnotics (6) Stimulants (3) (-) Volatiles (1) Test Sub-Category Other (1) Test Test Name 0556U Benzidine, Urine