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 (1) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (1) Test Category (-) Antihypertensives (1) Test Sub-Category (-) Alpha-2 Adrenergic Antagonists (1) Beta Blockers (1) Calcium Channel Blockers (1) Test Test Name 4830U Yohimbine, Urine