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 Analgesics (2) Test Sub-Category Alcohols (3) (-) Opiates/Opioids (2) Other (17) Test Test Name 4312B Tapentadol - Free, Blood 4312U Tapentadol - Total, Urine