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) Test Area Therapeutics (2) Test Category Antidepressants (5) Antiepileptics/Antiseizures (6) Antineoplastics (2) Antipsychotics (2) (-) Antirheumatics (2) Bronchodilators (3) Cholinesterase Inhibitors (2) Diuretics (2) Immunosuppressants (5) Muscle Relaxants (2) Other (1) Vasodilators (2) Test Sub-Category (-) Other (2) Test Test Name 4489B Tofacitinib, Blood 4489SP Tofacitinib, Serum/Plasma