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 Analgesics (1) Test Sub-Category Alcohols (3) (-) Opiates/Opioids (1) Other (12) Test Test Name 4312B Tapentadol - Free, Blood