Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (4) Enzyme-Linked Immunosorbent Assay (ELISA) (1) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (15) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (5) (-) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (1) Sample Type Blood (2) Serum or Plasma (2) (-) Urine (2) Test Area Exposure (1) Therapeutics (1) Test Category Metals/Elements (1) Sedative/Hypnotics (1) Test Sub-Category Other (1) Toxic Elements (1) Test Test Name 4170U Secobarbital, Urine 4190U Silicon, Urine