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 Acids (3) Analgesics (13) Anesthetics (6) Antidepressants (14) Antidiabetics (2) Antiepileptics/Antiseizures (9) Antihistamines (2) Antihypertensives (6) Antimicrobials (3) Antineoplastics (2) Antiparkinsons (3) Antipsychotics (15) Antirheumatics (2) Biomarkers (6) Bronchodilators (4) Cholinesterase Inhibitors (2) Depressants (2) Diuretics (2) Immunosuppressants (5) Metals/Elements (23) (-) Muscle Relaxants (2) Other (1) Sedative/Hypnotics (6) Solvents (5) Stimulants (3) Sympathomimetic Amines (3) Terpenes (3) Vasodilators (2) Volatiles (6) Test Sub-Category Other (2) Test Test Name 4487B Tizanidine, Blood 4487SP Tizanidine, Serum/Plasma