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) (3) Sample Type Blood (3) (-) Serum or Plasma (3) Test Area Therapeutics (3) Test Category (-) Antidiarrheals (1) Antiepileptics/Antiseizures (3) Antihistamines (2) Antipsychotics (2) Hallucinogens (2) (-) Immunosuppressants (2) Metals/Elements (1) Test Sub-Category (-) Other (3) Test Test Name 2531SP Leflunomide as Metabolite (Therapeutic Drug Monitoring), Serum/Plasma 2532SP Leflunomide as Metabolite (Pre-Pregnancy Monitoring), Serum/Plasma 2533SP Loperamide and Metabolite, Serum/Plasma