Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (3) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) Sample Type Blood (1) (-) Fluid (1) (-) Serum or Plasma (1) Tissue (1) Urine (1) Test Area Therapeutics (2) Test Category Antiarrhythmics (1) Anticholinergics (1) (-) Antihistamines (2) Antitussives/Cough Suppressants (3) Cholinesterase Inhibitors (2) Diuretics (2) Potassium Channel Blockers (1) Test Sub-Category (-) Other (2) Test Test Name 1760FL Diphenhydramine, Fluid 1760SP Diphenhydramine, Serum/Plasma