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 Sympathomimetic Amines (2) Test Sub-Category Alkaloids (2) Alpha Blockers (1) Antibiotics (2) Anticholinergics (2) Barbiturates (3) Benzodiazepines (3) Beta-2 Andrenergic Agonists (1) Beta Blockers (1) Cyanide (2) Diuretics (1) NSAIDs (1) Opiates/Opioids (8) Other (35) Phenothiazines (4) Sedative-Hypnotics (1) Sulfonylureas (2) Toxic Elements (11) Tricyclic (6) (-) Vasoconstrictors (2) Test Test Name 4350SP Tetrahydrozoline, Serum/Plasma 4350U Tetrahydrozoline, Urine