Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (3) Enzyme Immunoassay (EIA) (1) (-) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (2) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (3) Sample Type Blood (1) Serum or Plasma (1) Test Area (-) Therapeutics (2) Test Category Antithrombotics (2) Test Sub-Category Anticoagulants (2) Test Test Name 4800B Warfarin, Blood 4800SP Warfarin, Serum/Plasma