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) (1) Sample Type Blood (2) Serum or Plasma (2) (-) Urine (1) Test Area (-) Therapeutics (1) Test Category Analgesics (1) Antianxiety (3) Anticholinergics (1) Antidepressants (4) Antihistamines (2) (-) Antihypertensives (1) Antitussives/Cough Suppressants (4) Potassium Channel Blockers (1) Stimulants (1) Test Sub-Category Calcium Channel Blockers (1) Test Test Name 1640U Diltiazem, Urine