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 (2) (-) Urine (1) Test Area Therapeutics (1) Test Category Acids (1) Analgesics (6) Antidepressants (5) Antiepileptics/Antiseizures (3) Antimicrobials (1) Antiparkinsons (1) Antipsychotics (3) Biomarkers (2) (-) Bronchodilators (1) Metals/Elements (8) Sedative/Hypnotics (1) Solvents (2) Stimulants (1) Sympathomimetic Amines (1) Volatiles (1) Test Sub-Category Other (1) Test Test Name 4387U Theophylline, Urine