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) Test Area Therapeutics (1) Test Category Immunosuppressants (1) Test Sub-Category (-) Other (1) Test Test Name 2531B Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood