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) (5) (-) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (1) Serum or Plasma (1) Test Area Therapeutics (2) Test Category Antithrombotics (2) Test Sub-Category (-) Anticoagulants (2) Cyanide (3) Other (5) Test Test Name 4800B Warfarin, Blood 4800SP Warfarin, Serum/Plasma