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) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (3) Fluid (2) Hair (1) Serum or Plasma (5) Tissue (2) (-) Urine (2) Test Area Exposure (1) Therapeutics (1) Test Category (-) Acids (1) (-) Analgesics (1) Antiarrhythmics (1) Antidepressants (3) Antihypertensives (1) Depressants (2) Metals/Elements (1) Other (1) Sedative/Hypnotics (1) Test Sub-Category Carboxylic Acids (1) Opiates/Opioids (1) Test Test Name 2079U Fentanyl and Metabolite, Urine 2134U Formic Acid, Urine