Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) Sample Type Blood (5) Serum or Plasma (6) (-) Urine (2) Test Area Drugs of Abuse (1) Exposure (1) (-) Therapeutics (2) Test Category Antihypertensives (1) Expectorants (1) Test Sub-Category (-) Alpha-2 Adrenergic Agonists (1) Antivirals (1) GABA Analogues (1) (-) Other (1) Test Test Name 2185U Guaifenesin, Urine 2186U Guanfacine, Urine