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 (1) (-) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (2) Test Category Antidiabetics (3) Antiepileptics/Antiseizures (3) Antihypertensives (2) Antimicrobials (3) Cholinesterase Inhibitors (1) Depressants (2) (-) Expectorants (2) Metals/Elements (6) Sedative/Hypnotics (2) Solvents (2) Test Sub-Category Other (2) Test Test Name 2185SP Guaifenesin, Serum/Plasma 2185U Guaifenesin, Urine