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 Alcohols (8) Anesthetics (1) Antianxiety (2) Antiarrhythmics (2) Anticholinergics (2) Antidiabetics (2) Antidiarrheals (1) Antiepileptics/Antiseizures (12) Antihistamines (5) Antipsychotics (6) Antithyroids (1) Antitussives/Cough Suppressants (4) Biomarkers (2) Carbonic Anhydrase Inhibitors (1) Cholinesterase Inhibitors (1) Diuretics (1) Emetics (2) (-) Expectorants (2) Hallucinogens (12) Herbicides (2) Hydrocarbons (1) Immunosuppressants (2) Laxatives (1) Metals/Elements (14) Muscle Relaxants (5) NMDA Antagonists (1) Pesticides/Insecticides (2) Retinoids (2) Sedative/Hypnotics (5) Solvents (7) Stimulants (2) Volatiles (10) Test Sub-Category (-) Other (2) Test Test Name 2185SP Guaifenesin, Serum/Plasma 2185U Guaifenesin, Urine