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) (2) Gas Chromatography/Mass Spectrometry (GC/MS) (2) Headspace Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (31) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (7) (-) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (2) Spectrophotometry (SP) (1) Sample Type (-) Blood (1) Serum or Plasma (1) (-) Urine (1) Test Area Exposure (2) Test Category Metals/Elements (2) Test Sub-Category Toxic Elements (2) Test Test Name 4190B Silicon, Blood 4190U Silicon, Urine